Harr Microbiology Practice Test

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• Which type of agar is used specifically for the selective growth of gram-positive cocci?
• What is the formalin-ether concentration procedure primarily used to demonstrate?
• Which characteristic is associated with the rhabditiform larvae of Strongyloides stercoralis?
• Fever, abdominal cramping, watery stools, and fluid and electrolyte loss preceding bloody stools is characteristic of shigellosis but may also result from an infection with:
• Which bacteria are commonly tested for in clinical samples to confirm anaerobic infections?
• Which condition indicates that humans are the accidental intermediate host after ingesting eggs?
• Which bacteria is indicated by a positive catalase and oxidase test alongside yellow pigment production?
• Which organism is primarily associated with the consumption of undercooked bear meat?
• Which pathogen requires 'enteric precautions' to prevent nosocomial infections in patients with severe diarrhea?
• Which organism is known to produce 'fried-egg' colonies on agar?
• Which Enterobacteriaceae genus is typically resistant to colistin?
• Which yeast enzyme is detected using birdseed (niger seed) agar?
• What is a common symptom associated with infection from enteric pathogens such as Shigella?
• What is commonly tested to differentiate Candida species?
• Which protozoan organism has been linked to waterborne and foodborne outbreaks in the U.S.?
• Which reaction indicates a presumptive identification of Enterococcus faecalis?
• What organism is suggested if gram stain shows sulfur granules containing gram-positive rods?
• What is the identification of an anaerobic gram-positive bacillus found in a surgical site infection with noted sensitivity and resistance criteria?
• A 29-year-old male with skin ulcers and a poorly staining coccobacillus is indicative of which organism?
• Which Mycobacterium species does not produce the enzyme required to convert niacin to niacin ribonucleotide?
• What is the correct identification for a catalase-negative, gram-positive coccus resembling staphylococci isolated from blood cultures of a patient with endocarditis?
• What is one potential serious outcome of untreated genital herpes simplex virus infection?
• What characteristic distinguishes Streptococcus pneumoniae from other streptococci?
• Which test would most likely confirm a diagnosis of giardiasis?
• Which Staphylococcus species is typically identified as coagulase negative and novobiocin sensitive?
• Which tests are most appropriate to differentiate between Pseudomonas aeruginosa and Pseudomonas putida?
• Despite experiencing symptoms, a patient was negative for giardiasis after three stool exams. This could be due to what reason?
• Which Aspergillus species is the most common cause of pulmonary aspergillosis?
• For which clinical specimens is the KOH direct mount technique for examination of fungal elements used?
• A patient with pneumonia has negative H2S and positive urease on culture, what is the likely organism?
• The Hair Baiting Test is used to differentiate which two species of Trichophyton that produce red colonies on Sabouraud agar plates?
• Which species of Haemophilus is notably difficult to isolate from genital ulcers?
• A 12-year-old girl is brought to the emergency department with meningitidis. What motile amoeba is likely found in the CSF?
• What procedure should be taken for a hunter bitten by a fox suspected of rabies?
• In an immunocompromised patient with vancomycin-resistant, catalase-negative cocci isolated, what other organisms might be responsible?
• What finding can lead to a presumptive diagnosis of Gardnerella vaginalis?
• What characteristic findings on a Gram stain smear suggest a diagnosis of Gardnerella vaginalis?
• In which situation might a false-positive CAMP test for group B streptococci occur?
• Which biochemical test is not useful for distinguishing between Enterobacteriaceae and nonfermentative gram-negative bacilli?
• Which two tests are best for differentiating S. bovis from Streptococcus salivarius?
• At what temperature does Mycobacterium marinum optimally grow on Lowenstein-Jensen agar?
• Is it true or false that cultures of parasites require no quality control compared to bacterial cultures?
• What test differentiates Cardiobacterium hominis from Actinobacillus spp.?
• An organism that shows bottle-brush growth in stab culture is most likely:
• A complete stool culture procedure should routinely include media for isolating which of the following?
• Alcaligenes faecalis can be distinguished from Bordetella bronchiseptica using which test?
• Identify the incorrect match between method and its objective.
• Which Mycobacterium species, associated with tuberculosis in cattle, also causes tuberculosis in humans?
• Which tests best distinguish Enterobacter aerogenes from Edwardsiella tarda?
• What do Babesia parasites morphologically resemble?
• Which Pseudomonas species is usually associated with lung infections related to cystic fibrosis?
• What is the most reliable method for confirming Mycoplasma pneumonia in serum?
• In a culture from an intra-abdominal abscess producing orange-tan colonies, what is the most likely identification based on oxidase positive and DNase positive results?
• Identify the organism in a post-surgical abdominal wound drainage showing anaerobic gram-negative bacilli and specific antibiotic resistance.
• In infections with Taenia solium, what role do humans play?
• For a presumptive diagnosis of gonorrhea, which criteria must be present from an exudate?
• Which characteristic differentiates E. coli from Shigella species?
• Which test group best differentiates Acinetobacter baumannii from Pseudomonas aeruginosa?
• Which group of β-hemolytic streptococci is identified using a bacitracin A disk?
• Early ring stages of the fifth human malaria, Plasmodium knowlesi, closely resemble which of the following?
• What most affects the oxidation-reduction potential (Eh or redox potential) of media for anaerobic bacteria?
• What explains a positive RT-PCR for HIV-1 followed by a negative Western blot?
• A cystic fibrosis patient’s sample shows mucoid growth on blood agar. What is the expected identification?
• What potential problems can occur when using EDTA anticoagulant and holding blood prior to preparation of thick and thin blood films?
• In an outbreak of diarrheal disease linked to a municipal water supply, what is the most likely causative agent?
• Given the carbohydrate reactions, which Neisseria species is most likely identified in a vaginal swab?
• Carbohydrate assimilation tests are conducted using media that are?
• What property do Streptococcus species exhibit?
• Which organism is indicated by the presence of a yellow pigment and positive nitrate reduction?
• What organism is most likely identified from a culture of gram-negative rods with oxidase positive, glucose OF positive, and red pigment?
• Which of the following characteristics best describe Fusobacterium spp.?
• Which dematiaceous mold forms flask-shaped phialides, each with a flask-shaped collarette?
• What clinical specimen should be examined for microfilariae in patients with eosinophilia and lymphadenopathy post travel to tropical regions?
• What type of stain can be used to observe the presence of bacteria in leukocytes for diagnosis?
• Which organism is indicated by a catalase-positive, gram-positive coccus that grew pale yellow colonies on blood agar from a patient with impetigo?
• A nonfermenter recovered from an eye wound is oxidase positive, motile with polar monotrichous flagella, and grows at 42C. To which DNA homology group should this organism be classified?
• Burkholderia pseudomallei is associated with which of the following diseases?
• The miracidial hatching test is used to assess the viability of eggs from which organism?
• What test differentiates S. pneumoniae from viridans streptococci?
• How do Mycobacteria appear when stained by the Ziehl-Neelsen or Kinyoun methods with a methylene blue counterstain?
• What characteristic color indicates Vibrio cholerae on TCBS agar?
• What is the appropriate media for culturing suspected Corynebacterium diphtheriae from a nasopharyngeal swab?
• What is the most likely cause of rash in a father exposed to his children with chickenpox?
• Chryseobacterium spp. are distinguished from Acinetobacter spp. by which two tests?
• What is the most sensitive recovery method for Acanthamoeba spp. from lens care solutions?
• Which organism is characterized by spherules containing endospores found in a sputum specimen?
• What gastrointestinal infections are most commonly caused by extended-spectrum B-lactamase (ESBL) producers?
• What is the most likely organism found in a bloody stool sample with certain biochemical results indicating non-lactose-fermenting colonies?
• Which genera of the Enterobacteriaceae are known to cause diarrhea and are considered enteric pathogens?
• Which antibiotic is typically avoided in treating infections caused by anaerobes?
• A patient with >100,000 col/mL of a nonhemolytic, catalase-negative organism in urine culture is likely infected by which organism?
• What test rapidly differentiates Micrococcus from Staphylococcus?
• Brucella spp. are known for causing which of the following conditions?
• What is the most rapid method for diagnosing a genital herpes simplex (HSV-2) infection?
• What is the main symptom associated with schistosomiasis?
• What is the specimen of choice for diagnosing food poisoning caused by Bacillus cereus?
• A patient with asymptomatic amebiasis is found to possibly have Entamoeba dispar instead of the pathogenic species. What should be recommended?
• Cutaneous disease involving skin, hair, and nails usually indicates an infection with a?
• What is the most common viral syndrome associated with pericarditis, myocarditis, and pleurodynia?
• In a clinical lab, which media is best used for the growth of Neisseria gonorrhoeae?
• After a nursing student accidentally stuck herself with a needle, what is the best course of action?
• Which antibiotic is used in the Optochin disk test to differentiate S. pneumoniae?
• Which of the following structures is invaded by the genus Trichophyton?
• A rapidly growing hyaline mold began as a white colony but soon developed a black 'pepper' effect on the agar surface. What is the most likely identification?
• How do humans acquire infections with Diphyllobothrium latum adult worms?
• Which test results after 3 weeks of incubation on Lowenstein-Jensen agar are consistent with Mycobacterium tuberculosis?
• Which media is primarily used for the recovery of fecal pathogens?
• According to the American Thoracic Society's definition, what level of service does a lab providing acid-fast staining and inoculation cultures fall under?
• Which organism, commonly found in fecal flora, can be confused with Yersinia due to biochemical similarities?
• What is a common outcome when β-lactamase is produced by Staphylococcus aureus?
• Which services for mycobacteria are performed by a Level II laboratory according to CAP guidelines?
• Which amino acids are essential for the growth of Francisella tularensis?
• Which susceptibility test identifies group A β-hemolytic streptococci?
• Fecal immunoassays are commonly used to diagnose infections with which organisms?
• Which structure do Chlamydospores primarily indicate in yeast?
• A 24-hour unpreserved urine specimen is most useful for recovering which of the following?
• The manganous chloride-urea test is used to identify which organism?
• Which group of tests assists in the rapid identification of the Enterobacteriaceae family?
• How does the presence of H2S affect lysine iron agar?
• Which virus is associated with adult gastroenteritis from contaminated food and water?
• Charcot-Leyden crystals in stool are thought to be formed from the breakdown products of which type of cells?
• Which organism is differentiated from Micrococcus spp. using furazolidone susceptibility testing?
• A patient returning from Africa has low-grade fever and malaise. What information is crucial for malaria testing?
• Which of the following is true regarding Cryptococcus neoformans?
• Which respiratory virus is most often associated with severe disease in young children and infants?
• What test is the most appropriate for differentiating Bacillus anthracis from other Bacillus species?
• A culture showing short gram-positive bacilli with no hemolysis and negative catalase suggests which organism?
• What is the main benefit of using a flexible calcium alginate swab for nasopharyngeal sampling?
• A sputum sample from a patient shows a growth of a lavender-green pigment. Which organism is most likely?
• Toxic shock syndrome is most commonly attributed to infection with which organism?
• What viral serological test should be performed on a 25-year-old male with symptoms similar to chronic fatigue syndrome when other tests are negative?
• Which organism is indicated by thin, nonpigmented anaerobic gram-negative rods found on anaerobic blood agar with specific growth characteristics?
• What further testing should be done for a 6-month-old infant diagnosed with respiratory infection and apnea when bacterial cultures are negative?
• What single test is most effective in separating Klebsiella oxytoca from K. pneumoniae?
• Antimicrobial susceptibility testing of anaerobes is done by which method?
• What is the likely identification of a sputum culture from a cystic fibrosis patient that grew a predominance of oxidase-negative, short gram-negative rods?
• Based on laboratory tests, what is the most likely identification of the organism from the blood cultures of a diabetic patient?
• A positive Simmons citrate test is indicated by what color change in the medium?
• Which Enterobacteriaceae are known to commonly produce hydrogen sulfide (H2S)?
• Which of the following tests best differentiates Shigella species from E. coli?
• Which yeast is characteristically positive for germ tube production?
• What are the most common causes of viral pneumonia in adults?
• Which Mycobacterium species is characterized by positive urease and considered a photochromogen?
• Which organism is most likely identified from the stool of a cystic fibrosis patient that exhibits mucoid colonies?
• What is the suspected organism in a nonimmunized child with cough and flu-like symptoms when a gram-negative coccobacillus is cultured from several media?
• Blastoconidia are the beginning of which structures?
• What characteristic do Klebsiella pneumoniae and Enterobacter cloacae share that makes them similar in identification?
• In the context of a central nervous system infection, the detection of which yeast is most clinically relevant?
• What is the correct identification of the causative organism in a severe outbreak of diarrhea following municipal water exposure?
• A Gram stain of a urethral discharge showing gram-negative diplococci indicates which organism?
• What does a positive result on birdseed agar suggest?
• Tinea versicolor is a skin infection caused by which organism?
• What organism is associated with the transmission of Chagas disease?
• Cerebrospinal fluid (CSF) specimens that cannot be cultured immediately should be:
• Slime production is a characteristic associated with which Staphylococcus species?
• After returning from India, a patient with eosinophilia is most likely to have which clinical specimen and organism match?
• Staphylococcus epidermidis is most commonly recovered from which of the following sources?
• A gram-positive branching filamentous organism that stains positive with a modified acid-fast stain is likely:
• Which two helminth eggs may resemble each other?
• What is the most likely identification of the organism in a patient with neurological difficulties and a cloudy CSF showing gram-positive long-beaded bacilli?
• What is the primary difference when staining Cystoisospora belli oocysts compared to traditional acid-fast bacilli (AFB) stains?
• Which virus is commonly tested for in stool samples from children showing symptoms of gastroenteritis?
• For diagnosing Pneumocystis jirovecii in an immunocompromised patient, which specimen is preferred?
• Which of the following antibiotics is Group B streptococci resistant to?
• What may indicate the presence of a coagulase-positive Staphylococcus in a culture?
• Decarboxylation of amino acids lysine, ornithine, and arginine results in which products?
• What should be done with a lymph node biopsy fixed in formalin submitted for AFB smear?
• Which test is necessary to differentiate Mycobacterium scrofulaceum from another mycobacterium?
• What is the routine laboratory test for diagnosing Treponema pallidum infections?
• Which swab is ideal for recovering Corynebacterium diphtheriae from the nasopharynx?
• Haemophilus influenzae, which causes ocular infections, requires which factors in the primary medium for growth?
• What does a positive CAMP test suggest in relation to streptococci?
• An isolate produced a constriction that was interpreted as a positive germ tube, but Candida albicans was ruled out. Which of the following fungi is the most likely identification?
• What specimens should be obtained to establish a diagnosis of Lyme borreliosis?
• How can nonpathogenic Moraxella species be differentiated from Neisseria species?
• Which of the following is a key characteristic of the thick blood film?
• Why is PCR testing preferred for Chlamydia trachomatis detection?
• Putrescine is an alkaline amine product of which bacterial enzyme?
• What is the most likely cause of encephalitis in a man who has been working in a garden with a lot of dead birds and high mosquito populations?
• Which bacterial species is characterized by being β-hemolytic and a common cause of throat infections?
• Which drug is considered the treatment of choice for a methicillin-resistant Staphylococcus aureus infection?
• What is the most probable identification of a nonmotile gram-negative coccobacillus from CSF that is positive for indophenol oxidase?
• Which organism is identified in a pregnant woman experiencing flu-like symptoms with a positive urine culture and a blood culture revealing a gram-positive short rod?
• To differentiate the Morganella and Proteus genera, which group of tests is most effective?
• Which organism likely matches with a direct smear from a nasopharyngeal swab revealing metachromatic granules?
• In serological testing for Epstein-Barr virus, which of the following is least likely to help with diagnosis?
• What end product of glucose fermentation does the Voges-Proskauer (VP) test detect?
• Based on specific reactions, which organism is likely to be identified from a newborn's blood cultures?
• Which test is critical for identifying an organism suspected of eukaryotic infection if the patient has been on antibiotics?
• What is the most appropriate screening media for Staphylococcus aureus in the nursery department?
• What test can differentiate Pseudomonas aeruginosa from other nonfermentative gram-negative bacilli?
• What is the small, single-stranded DNA virus known as the fifth childhood disease?
• An isolate of E. coli recovered from the stool of a patient with severe bloody diarrhea should be tested for which sugar?
• Why might both lactose-positive and lactose-negative colonies from stool culture need further testing for pathogens?
• From a gastric ulcer biopsy, which organism is likely if curved, gram-negative bacilli that test positive for urease are cultured?
• What is the most significant factor in determining whether a blood culture is indicative of Yersinia enterocolitica?
• What atmospheric condition is required to recover Campylobacter species from selective agar?
• Which test is used for confirming the identity of a strain of Staphylococcus aureus?
• Which of the following organisms are transmitted to animals and humans after a tick bite?
• In a stool culture showing aerobic gram-negative rods, which organism is likely if the patient had pseudoappendicular syndrome?
• In which biochemical category does Actinobacillus spp. fall?
• Which bacterial group is identified as growing well on agar containing 20% bile and resistant to kanamycin and vancomycin?
• An isolate from CSF growing on cornmeal agar produces specific structures. Which test should be performed next?
• What is the purpose of adding sodium polyanetholsulfanate (SPS) to nutrient broth media for blood cultures?
• Cystine tryptic digest (CTA) media for Neisseria species should be inoculated and cultured in which of the following conditions?
• What is the virus associated with venereal and respiratory tract warts?
• Which virus is responsible for causing common cold symptoms?
• Which of these organisms is primarily associated with necrotizing fasciitis?
• Which parasite stage is immediately infective for humans on passage from the gastrointestinal tract?
• Which test determines inducible clindamycin resistance in staphylococci and streptococci?
• Which of the following Mycobacteria is NOT associated with skin infections?
• The yeast form of which dimorphic mold shows a large parent yeast cell surrounded by smaller budding yeast cells?
• A 25-year-old pregnant patient with vaginal irritation likely has vaginosis caused by which organism?
• A pure culture from an immunosuppressed patient yielded an organism that is nonmotile and positive for indophenol oxidase. What is the likely identification?
• Staphylococcus saprophyticus can be differentiated from Staphylococcus epidermidis by its resistance to which antibiotic?
• Colistin-nalidixic acid agar (CNA) is primarily utilized for the isolation of which type of bacteria?
• In a urine culture showing more than 100,000 col/mL, what test is best for differentiating S. epidermidis from S. saprophyticus?
• Which characteristic differentiates Moraxella catarrhalis from other Neisseria species?
• Which agar is specifically recommended for recovering Bordetella pertussis from nasopharyngeal specimens?
• Which parasite is responsible for eosinophilic meningoencephalitis with symptoms like fever and headache?
• A Mycobacterium species recovered from an AIDS patient showed negative results for niacin and Tween 80 hydrolysis. What is the most likely identification?
• What type of bacteria are small, Gram-negative rods that may indicate infection with HACEK organisms?
• What is the likely identification of a gram-negative rod cultured from a pneumonia patient?
• What organism is likely responsible for a urinary tract infection in an immunocompromised patient based on the given tests?
• What is the most likely organism in a stool culture with symptoms of dysentery from Mexico City?
• Which two yeast isolates can be differentiated by arthroconidia production?
• In hydatid disease, which classification correctly identifies the causative agent and its host?
• What is a notable characteristic of Yersinia pestis?
• What animal harbors the adult tapeworm of Echinococcus granulosus?
• In parasitology, what is considered a STAT procedure?
• Which dimorphic fungus exhibits a filamentous mold form at room temperature and converts to yeast form above 35C?
• What is the most likely identification for an oxidase-positive gram-negative rod with specific biochemical results indicating V. parahaemolyticus?
• Deoxycholate agar (DCA) is useful for the isolation of which group of bacteria?
• What is the heat-stable catalase result expected for Mycobacterium species that are positive at 68°C?
• What organism is most likely responsible for pneumonia in a patient with flulike symptoms after returning from the Southwestern United States?
• Which tests are used for the presumptive identification of Cryptococcus neoformans?
• What is a common method for presumptive identification of yeast infections in clinical samples?
• After isolating Staphylococcus aureus from a diabetic patient showing methicillin resistance, which additional antibiotic should be tested for susceptibility?
• Which Enterobacteriaceae produces Shiga-like toxin primarily?
• Which virus in the Reoviridae group causes gastroenteritis in infants and young children?
• What organism is likely identified in an elderly woman with suspected cat-scratch disease, characterized by a small, curved gram-negative bacillus?
• What is the first step to be performed in the identification of an unknown yeast isolate?
• Which organism is incorrectly matched with its method of infection?
• A gram-positive coccus from a wound culture shows B-hemolytic colonies. The most likely identification is?
• Which of the following Mycobacterium spp. would be most likely to grow on a MacConkey agar plate?
• What do newer findings suggest about the pathogenicity of Blastocystis hominis?
• The L-pyrrolidonyl-B-napthylamide (PYR) hydrolysis test is used for which group of streptococci?
• What does the Superoxol test rapidly test for?
• Why is it important to maintain iodine on the skin for at least 60 seconds during blood culture preparation?
• In terms of morphology, what is a distinguishing feature of the genus Candida?
• Which organism is primarily responsible for cysticercosis in humans?
• A mold that produces colonies with a dark brown, green-black, or black appearance on both the surface and reverse side is classified as what type?
• What condition might be indicated by the isolation of anaerobic gram-negative rods post-gallbladder surgery?
• When should a patient on steroid therapy be closely monitored for Strongyloides stercoralis reactivation?
• What method is primarily used to culture Mycoplasma hominis from genital specimens?
• Which Neisseria species is typically found in the normal flora of the human throat?
• Which microfilariae are usually not found circulating in the peripheral blood?
• Microsporidial infections can be confirmed using which of the following techniques?
• Care must be taken when identifying biochemical isolates of Shigella because of serological cross reactions with which organism?
• Which of the following is NOT a common testing method for diagnosing Lyme disease?
• The mycelial form of which dimorphic mold produces thick-walled, rectangular, or barrel-shaped alternate arthroconidia?
• What organism is identified in blood cultures from a septic patient who received packed RBCs?
• Identification of Clostridium tetani is primarily based on which method?
• Which test is performed to confirm an infection with Clostridium botulinum?
• Which organism is primarily responsible for cervical lymphadenitis in children?
• Brucella melitensis and Brucella abortus can be differentiated by their growth on media containing which two dyes?
• Which method is used to identify anaerobes aside from packaged microsystems?
• What test is performed to check the capability of an organism to utilize sodium malonate?
• In a 1-month-old infant with suspected meningitis, which preliminary tests would help differentiate L. monocytogenes from Streptococcus spp.?
• In Breakpoint Antimicrobial Drug Testing, what does S, I, and R indicate?
• Which of the following enzymatic tests is used to identify enterococci?
• Which of the following is a common characteristic of microsporidia?
• Which parasite is known to cause a significant public health concern due to its association with a potentially fatal condition called blackwater fever?
• How can Enterobacter sakazakii be differentiated from Enterobacter cloacae?
• What organism is most commonly recovered as a gram-positive cocci from blood cultures of patients with endocarditis?
• A rapidly growing nonseptate mold produced colonies resembling cotton candy. What is the most likely identification?
• Which organism resonates with the tests noted for a vancomycin-resistant gram-positive coccobacillus isolated from blood?
• What type of ticks are primarily responsible for transmitting Ehrlichia and Anaplasma spp.?
• In which department should a single tube of CSF obtained from a 12-month-old boy be submitted?
• What infection can be caused by eating poorly cooked pork?
• For the identification of a yeast infection in a patient, which test would not support a diagnosis of Candida albicans?
• A pink yeast isolate from a patient with AIDS has what likely identification given certain results?
• A 69-year-old patient with a cough had a fungal culture revealing septate hyphae with dichotomous branching. What is the likely identification?
• Which medium is preferred for recovering Vibrio cholerae from stool specimens?
• Which presumptive test is used for the identification of Pseudomonas species?
• Which disease is incorrectly matched with its symptoms?
• Chlamydospore production is demonstrated by which species of Candida?
• What is a common result for viridans streptococci in the bile esculin test?
• What is the most likely identification for an organism that requires hemin and NAD for growth in a patient undergoing chemotherapy?
• What is responsible for the satellite growth of Haemophilus spp. around colonies of Staphylococcus and Neisseria spp. on sheep blood agar?
• The classic form of foodborne botulism is characterized by the ingestion of what?
• Which virus has a 90% transplacental infection rate when found in an infected mother?
• The yeast form of which dimorphic fungus appears as oval or elongate cigar shapes?
• Which statement accurately describes an Entamoeba histolytic trophozoite?
• Which genus of small gram-negative coccobacilli is associated mainly with animals but can infect humans?
• At which pH does the methyl red (MR) test become positive?
• What type of results does Geotrichum demonstrate on cornmeal Tween 80 agar?
• Which of the following is an incorrect match between symptoms and disease?
• Which virus is implicated along with Epstein-Barr virus as a cause of infectious mononucleosis?
• The malonate test is most useful in differentiating which members of the Enterobacteriaceae?
• Identify the mismatched bacterium and specimen pairing.
• In the U.S., blood agar plates are commonly made using red blood cells from which animal?
• What does a positive slide coagulase test for Staphylococcus aureus indicate?
• The gram-positive non-spore-forming anaerobic rods most frequently recovered from blood cultures as a contaminant are:
• Which organism causes bacterial vaginosis, as indicated by the presence of 'clue cells' and a fishy odor?
• What are key characteristics of Toxoplasma gondii?
• What characteristic is most commonly associated with Haemophilus influenzae strains that are resistant to ampicillin?
• Specimens for virus culture should be transported in media containing which of the following?
• What is the correct sequence for skin cleansing during the aseptic collection of blood cultures?
• Which genera are positive for phenylalanine deaminase?
• Microscopic examination of a fungus cultured from a patient with athlete's foot showed large, smooth-walled, club-shaped macroconidia appearing singly or in clusters. What is the most likely identification?
• Which isolates of the Enterobacteriaceae family most commonly produce extended-spectrum B-lactamase (ESBL)?
• Given a mixture of slender gram-negative rods and coccobacilli after surgery, what is the likely organism if catalase is negative and oxidase is positive?
• Which mycobacterium is associated with Crohn's disease?
• To identify Haemophilus haemolyticus and Haemophilus parahaemolyticus, which plates should be used?
• Visceral larva migrans is primarily associated with which organism?
• Which Enterobacteriaceae species are often tested for their ability to ferment sorbitol?
• Which organism's recovery is enhanced by cold enrichment of feces in phosphate-buffered saline?
• Which organism may require sputum examination for diagnosis?
• Which gram-negative bacilli produce black pigment and brick red fluorescence when exposed to an ultraviolet light source?
• Which method could be used to confirm influenza infection in a patient with acute respiratory distress?
• Which group of organisms should be screened for B-lactamase production prior to susceptibility testing?
• Which two mycobacteria are commonly isolated from subcutaneous skin and thrive at 30°C?
• Egg yolk agar is used to detect which enzyme produced by Clostridium species?
• Autofluorescence, which requires no stain, is recommended for identifying which of the following?
• What is the cause of the variation in colony types seen with fresh isolates of Neisseria gonorrhoeae?
• Which organism can be cultured from the upper and lower respiratory tract but commonly diagnosed by changes in antibody titer?
• How are Micrococcus species typically characterized based on oxidase reactions?
• What type of specimen is most suitable for initial identification of invasive aspergillosis via soluble antigen testing?
• What thermodimorphic fungus is identified by rapidly growing mold at 25C with specific conidiophores under microscopy?
• Which is a common isolation medium for Actinobacillus spp.?
• A patient exhibits symptoms including fever and bloody stools 10 to 12 hours after eating. Which organisms are most likely to grow from this patient's stool culture?
• Which streptococci would most likely show a positive reaction to bacitracin?
• Which organism is characterized as an oxidase-positive, nonmotile gram-negative coccobacillus?
• What is a clinical test used for detecting viral infections other than culture?
• Which organism is most often implicated in opportunistic infections in immunocompromised hosts, particularly seen with filamentous fungi in lung infections?
• What is the most probable identification of an organism showing the following results: Coagulase = + at 4 hours, coagulase = Neg at 18 hours, and Novobiocin = Sensitive?
• Which organism is characterized by large, α-hemolytic colonies on blood agar?
• What tests should be performed to identify B-hemolytic colonies of gram-positive cocci from a newborn with skin eruptions?
• A 3-year-old who experienced vomiting and diarrhea should have a stool sample tested for which virus?
• What is the identification of staphylococci isolates that showed a positive tube test for free coagulase?
• Which organism is the most common cause of mucormycosis infection in humans?
• Which is the medium of choice for the selective recovery of gram-negative anaerobes?
• Which Haemophilus species is most commonly associated with endocarditis?
• Which M. avium complex (MAC) organism is the most frequently isolated from AIDS patients?
• Which feature is characteristic of Mycobacterium tuberculosis in a laboratory setting?
• Which organism is a yellow pigment-producing, oxidase positive, nonmotile organism that does not grow on MacConkey agar?
• What is the most likely identification of mycobacteria isolated from a hospital hot water system that grew at 42C and was non-pigmented?
• Which species of Shigella is most commonly associated with diarrheal disease in the United States?
• What type of hemolysis is often produced by Staphylococcus aureus on blood agar?
• Xylose lysine deoxycholate (XLD) agar is selective for which type of bacteria?
• Growth inhibition by thiophene-2-carboxylic hydrazid (T2H) differentiates M. tuberculosis from which Mycobacterium species?
• Which disease and diagnostic combination is likely for a transplant patient with increasing diarrhea?
• Which medium can best differentiate Kingella kingae from Eikenella corrodens?
• Which organism is identified as resistant to penicillin and ampicillin based on the provided test results?
• Which type of fungal infection is known to commonly occur in immunocompromised individuals?
• Which genus is known for its oxidase-negative, nonmotile characteristics?
• A patient who consumed bear meat and had fever and myalgia is likely infected with what organism?
• What is necessary for further testing of yeast from a catheterized patient following chemotherapy?
• Which agar is the standard choice for isolating Yersinia from stool specimens?
• What organism is identified by producing orange, waxy colonies and showing partial acid-fast staining?
• What differentiates catalase-positive Staphylococcus species from others?
• In culture, Clostridium perfringens typically shows which characteristic?
• What is the correct identification for an anaerobic gram-positive diphtheroid with specific results collected from blood culture?
• What is the most likely identification of a yeast isolate from a diabetic patient’s sputum?
• Which biochemical test is needed to differentiate Burkholderia cepacia from S. maltophilia?
• Which species is known for causing disseminated infections in immunocompromised patients?
• The bile solubility test primarily targets which species of Streptococcus?
• All of the following are examples of appropriate specimens for the recovery of fungi except:
• Which pathogen is frequently overlooked due to its lactose fermenting capability?
• What organism is indicated when a blood culture shows gram-positive cocci and sensitivity to vancomycin?
• A Vietnam War veteran with symptoms of melioidosis is likely to be infected with which organism?
• How are one or more acid-fast bacilli (AFB) reported according to the American Thoracic Society?
• What characteristic differentiates yeasts from molds?
• What type of virus is the hepatitis C virus?
• What is the primary test for differentiating Aeromonas spp. from the Enterobacteriaceae?
• Which group of molds can be ruled out when septate hyphae are observed in a culture?
• What organism should be suspected in a contractor who developed respiratory disease after inspecting an abandoned warehouse infested with rodents?
• A chemotherapy patient with severe diarrhea has anaerobic gram-positive, spore-forming bacilli isolated. What is the correct identification based on the culture results?
• What distinguishes the catalase test for mycobacteria from other bacteria?
• Which Mycobacterium species is predominantly associated with pulmonary infections?
• What patient information is essential when malaria smears are requested?
• Which Haemophilus species is commonly associated with conjunctivitis in children?
• In a urinary tract specimen, which interpretation fits the isolated B-hemolytic streptococci?
• Classification of viruses primarily relies on which aspect?
• Which agar plate effectively supports the growth of Haemophilus species that require V factor?
• What is the best specimen for recovery of mycobacteria from a sputum sample?
• What complication can influenza virus lead to in the elderly?
• What is the best noncultural test for diagnosing Gardnerella vaginalis in a case of vaginosis?
• Which organism is most likely identified in a 20-year-old female with gram-negative rods in blood cultures and urine samples, given the specific biochemical tests?
• What type of infections are associated with the HACEK group of organisms?
• What is the most likely organism in a cancer patient’s blood cultures showing lactose-negative, motile, gram-negative rods before antibiotic therapy?
• Which test result is NOT associated with the identification of Enteroinvasive E. coli (EIEC)?
• Which test is primarily used to distinguish the Micrococcaceae family from the Streptococcaceae family?
• How long should Mycobacterium tuberculosis-positive cultures be retained by the lab after testing?
• What is the most distinguishing feature between E. coli and Shigella based on their biochemical reactions?
• Which organism is typically positive for B-galactosidase?
• What is the most likely identification for a pediatric patient with bloody diarrhea and a clear colony on MacConkey agar with sorbitol?
• What is the most likely identification for a patient with a severe eye irritation caused by a gram-negative rod that tests positive for cytochrome oxidase?
• Which test is considered the best for confirming a Chlamydia trachomatis infection in urine samples?
• Which of the following organisms will display lipase activity on egg yolk agar?
• What concentration of sodium hydroxide (NaOH) is used to prepare a working decontamination solution for mycobacteria?
• Which two tests are negative for Mycobacterium avium-intracellulare complex?
• A hyaline mold recovered from a patient with AIDS produced rose-colored colonies with lavender centers on Sabouraud dextrose agar. What is the most likely identification?
• Which specimen is least likely to yield Trichomonas vaginalis?
• The India ink stain is used as a presumptive test for the presence of which organism?
• Among the tests for identifying an enteric pathogen, which is the most appropriate given the culture results of clear colonies on differential media?
• Which organism cannot typically be transmitted in the laboratory under normal conditions?
• An organism cultured from the skin produces colonies displaying a cherry-red color on Sabouraud dextrose agar after 3-4 weeks and teardrop-shaped microconidia along the side of hyphae. What is the most likely identification?
• Which technique is used for the confirmation of infection with human immunodeficiency virus (HIV-1)?
• The most noted differences between Pseudomonas aeruginosa and Stenotrophomonas maltophilia are:
• How long should iodine or iodophor remain on the skin when preparing for blood culture collection?
• Which rapid test differentiates Plesiomonas shigelloides from Shigella species?
• The δ-ALA test is confirmatory for the identification of which requirement in Haemophilus species?
• What pathogen is likely causing pneumonia and is confirmed by growth on buffered CYE agar with L-cysteine?
• What indicates that a Brazilian patient with cardiac issues most likely died from Trypanosomiasis?
• Bacillus anthracis can be differentiated from Bacillus cereus by which of the following tests?
• Which biochemical tests would differentiate between Shigella spp. and E. coli given their similarities?
• Which tests are needed for further identification of a gram-positive cocci that is catalase negative and B-hemolytic in a pregnant woman?
• What is the role of the tube coagulase test in differentiating staphylococci?
• What is the most likely identification of a facultative anaerobe from a human bite wound culture that shows Gram-negative straight, slender rods?
• A culture from a leg wound for a 70-year-old man indicated lactose-negative colonies on MacConkey agar. What is the most probable organism based on the biochemical reactions?
• What is the main reason E. coli cysts were barely visible on a permanent stained smear?
• Which Staphylococcus species is most often recovered from cases of toxic shock syndrome?
• What is the use of trimethoprim-sulfamethoxazole (SXT) disks in relation to streptococci?
• Key characteristics of infection with Plasmodium knowlesi include which of the following?
• Cycloserine-cefoxitin-fructose agar (CCFA) is primarily used for the recovery of which bacterium?
• In addition to coagulase, what factor significantly contributes to the pathogenicity of Staphylococcus aureus?
• Which pathogenic Enterobacteriaceae should laboratories be capable of serotyping?
• Which of the following characteristics is true for the Enterobacteriaceae family?
• Strains of Staphylococcus species that exhibit resistance to beta-lactam antibiotics are referred to as what?
• Which test differentiates Cedeccea from Serratia species?
• A gram-positive spore-forming bacillus producing a double zone of B-hemolysis on sheep-blood agar is presumptively identified as?
• What virulence factor is most commonly associated with Pseudomonas aeruginosa?
• What effect does sodium polyanetholsulfanate (SPS) have on bacterial recovery during blood culture?
• Which strain shows a weak or delayed bubbling reaction when using the Superoxol test?
• Which of the following is an incorrect match between organism and diagnostic procedure?
• After negative tests for several viruses, which viral test should be done in a young female with a sore throat and lymphadenopathy?
• The B-galactosidase test is used to identify which species of Neisseria?
• What is the likely cause of diarrhea in a patient whose modified acid-fast stained fecal smear reveals round structures with variable staining?
• What is the primary mode of transmission for dermatophyte infections?
• In an HIV-1 infection, what is the importance of CD4 lymphocyte quantitation?
• Which organism is likely identified from a gram-negative S-shaped rod grown at 42°C with positive oxidase and catalase tests?
• Older developing stages (trophs, schizonts) of Plasmodium knowlesi resemble those of which species?
• Which procedure is best for detecting motility in organisms?
• How can Hepatitis B virus be transmitted?
• Which Bacteroides species is noted for 'pitting' of the agar and is sensitive to penicillin 2-unit disks?
• What is the most likely identification for the fungus found on the feet of a patient with a culture showing specific characteristics after 8 days?
• What is used for preventing the growth of yeast and molds from vaginal specimens in culture?
• What is the preferred treatment for infections caused by Enterobacteriaceae?
• What organism likely causes white patches on the tongue of a healthy 2-month-old infant?
• Prereduced and vitamin K1-supplemented blood agar plates are recommended for the isolation of which organisms?
• Which stain can be used to detect oocysts of Cryptosporidium spp. in stool specimens?
• What was identified in a Gram stain from a gum lesion that showed amoebae?
• Which group of streptococci is primarily associated with a positive PYR test?
• What differentiates MacConkey agar from other culture media?
• What is the primary function of phenylalanine deaminase in certain bacterial genera?
• Approximately what percentage of group B streptococci can grow in 6.5% salt broth?
• Which method is used for rapid identification of classic infection with M. tuberculosis?
• Which parasitic organism is commonly transmitted through sexual contact?
• Which organism is responsible for causing primary atypical pneumonia?
• Which Clostridium species is most often recovered from a wound infection with gas gangrene?
• Which organism is known for producing beta-lactamases that may compromise treatment options?
• Which virus is the most common etiological agent of viral respiratory disease in infants and children?
• What is the most probable presumptive identification for slender, slightly curved, beaded, red mycobacterial rods that grew buff-colored microcolonies in a serpentine pattern?
• What is the ideal temperature range for the recovery of M. marinum?
• Eye infections caused by Acanthamoeba spp. have been most commonly traced to which factor?
• Based on culture results from a burn patient, what organism is indicated by the presence of oxidase positive and resistant to penicillin?
• A patient presenting with severe genital irritation and lesions tests negative for common STD pathogens. What should be the next line of testing?
• What color change indicates the presence of β-hemolysis, used to differentiate certain Haemophilus species?
• What is the significance of detecting beta-hemolysis on blood agar when diagnosing for Gardnerella vaginalis?
• What is the appropriate specimen to diagnose a viral cause for hemorrhagic cystitis in an immunocompromised patient?
• What type of staining method is often employed to visualize mycobacteria?
• What is the significance of discovering chlamydospores in a yeast culture?
• What organism is identified from a CSF sample growing gram-negative rods with positive ONPG and indole but negative motility?
• What is the primary characteristic of S. pneumoniae when subjected to the bile solubility test?
• Kligler iron agar (KIA) differs from triple-sugar iron agar (TSI) in which aspect?
• What is the most likely identification of a non-spore-forming, slender gram-positive rod found in a vaginal culture?
• A culture and sensitivity test on a catheterized urine specimen showed a colony count of over 100,000 col/mL of gram-positive cocci. What is the likely pathogen?
• During urease production testing, ammonia reacts to form which of the following products?
• What is the best medium for the recovery of Legionella pneumophila from clinical specimens?
• Which organisms should be considered in a waterborne outbreak of diarrheal disease?
• Which yeast species is characterized by a pink color and is germ tube-negative?
• What test can be performed to confirm the presence of a true negative reaction in the nitrate reduction test?
• A lactose-negative gram-negative rod that tests positive for indole and urease is likely which organism?
• Obligate anaerobes, facultative anaerobes, and microaerophiles are terms referring to bacteria that require:
• Which organism is identified based on growth as gram-negative rods resembling 'closed safety pins' in a patient with fever after a camping trip?
• Which of the following is NOT appropriate when attempting to isolate N. gonorrheae from a genital specimen?
• Identify the incorrect organism combination.
• Which test result indicates a positive reaction for an organism that is catalase-negative and associated with endocarditis?
• Which condition is primarily caused by the organism Plasmodium?
• In the ONPG test, what is primarily being distinguished?
• Which organism is identified using the urease test for ammonia production?
• A sheep blood agar plate is used as a primary isolation medium for all the following organisms except:
• What is the likely identification of a small, gram-negative coccobacillus that is indole positive and requires X factor for growth?
• Cysts of Iodamoeba butschlii are characterized by which feature?
• Which bacterial characteristic can differentiate Enterobacter from Klebsiella spp.?
• What is most commonly associated with massive hemolysis and central nervous system involvement?
• Which group of streptococci is known for producing erythrogenic toxins?
• Which nonpathogenic Mycobacterium species is often isolated from clinical specimens and known as the 'tapwater bacillus'?
• Which organism is indicated by a catalase-positive, gram-positive short rod with remarkable motility and β-hemolysis?
• Which organism is frequently confused with Salmonella species?
• Which Mycobacterium species is often mistaken for other Mycobacteria due to its atypical growth characteristics?
• Which mycobacterium of the M. tuberculosis complex fails to grow in culture and shows a 'croissant-like' morphology?
• Which Pseudomonas species is associated with exotoxin A and production of alginate?
• What type of cells are often misidentified as protozoa in a patient with diarrhea?
• Which organism is likely identified from a sputum culture producing gram-negative diplococci?
• What indicates a positive result for a nitrate reduction test in mycobacteria?
• What is the next step in diagnosing a patient with presumptive severe acute respiratory syndrome (SARS)?
• Which test is used to differentiate viridans streptococci from group D streptococci and enterococci?
• Which Mycobacterium species is best differentiated by the rapid hydrolysis of Tween 80?
• A culture from a dog bite wound grew a gram-negative, slender rod that is a facultative anaerobe. What is the most likely identification?
• Which Clostridium species causes pseudomembranous colitis or antibiotic-associated colitis?
• What is the most commonly used diagnostic method for identifying Lyme disease?
• What is the primary capsular serotype responsible for the majority of Haemophilus influenzae infections?
• Which test is used to differentiate Chryseobacterium spp. and Burkholderia cepacia?
• In the stool culture of a patient with severe diarrhea, what does the presence of clear colonies on MacConkey agar indicate?
• Non-A and non-B β-hemolytic streptococci generally show which reactions to bacitracin and SXT?
• Which organism is incorrectly matched with its characteristic?
• In which form are dimorphic molds found in infected tissue?
• Based on the recorded results from a blood culture, what is the likely identification of large gram-positive bacilli with lecithinase positive?
• Which two tests are best to differentiate A. hydrophilia from P. shigelloides?
• If a staphylococcus spp. is negative for the slide coagulase test and novobiocin resistance, what should be performed next?
• Yersinia pestis infections are most commonly found in which U.S. region?
• Lysostaphin is used to differentiate Staphylococcus from which other genus?
• What should the follow-up test be for cultured bacteria from a patient with alpha-hemolytic pneumonia?
• What is the primary function of the methyl red (MR) test?
• What characteristic differentiates Aeromonas spp. on selective enteric media?
• Which antibody's titer indicates a recent infection with group A β-hemolytic streptococci?
• What is the best medium for recovery and identification of V. cholerae from a symptomatic patient returning from South America?
• Based on specific biochemical tests, which group does not include Group A or B streptococci and shows sensitivity to SXT?
• How can the subspecies Haemophilus influenza (biogroup) aegyptius be differentiated?
• What is the most likely identification for a patient showing a budding yeast in blood cultures, with a negative germ tube test and positive urease test?
• An India ink test revealed many encapsulated yeast cells in a centrifuged CSF sample. Which yeast caused the diagnosed meningitis?
• Which organism likely caused the 'bulls-eye' colonies observed in a stool culture from a patient with enterocolitis?
• What is the quellung test used to identify?
• What is the best technique to identify Dientamoeba fragilis in stool?
• Which broth is used for the cultivation of anaerobic bacteria to detect volatile fatty acids?
• What is the most likely organism recovered from a cat scratch that shows smooth gray colonies with no hemolysis and is both catalase and oxidase positive?
• Which transport media is unsuitable for Neisseria gonorrhoeae cultures?
• Which virus is primarily responsible for the symptoms of chickenpox?
• Individuals showing a positive purified protein derivative (PPD) skin test for M. tuberculosis are usually which of the following?
• Material from a fungus-ball infection produced colonies with a green surface on Sabouraud agar. Which Aspergillus spp. is most probably identified?
• Microsporidia have been primarily implicated in human disease in which type of patients?
• What is the most efficient confirmation method for Legionnaires' disease from a sputum sample?
• In a patient with suspected bacterial vaginosis, which organism is typically isolated if lactobacilli are significantly decreased?
• What type of specimen is particularly tested with a KOH direct mount?
• What organism likely causes meningitis in a neonate presenting with gram-negative straight rods and a yellow pigment on culture?
• What is the minimum inhibition zone size indicating penicillin susceptibility for Streptococcus pneumoniae using an oxacillin disk?
• In a patient with severe diarrhea who ate a hamburger, which pathogen corresponds to the specific culture results indicative of E. coli O157:H7?
• Which virus can cause severe respiratory illness in infants?
• Which gram-negative diplococci can be presumptively identified from a positive oxidase test?
• Obligate anaerobic gram-negative bacilli that do not form spores and grow well in bile are most likely which organism?
• What is one of the main symptoms of a severe infection with Plasmodium falciparum?
• What type of media is typically used to culture dermatophytes?
• Which virus most likely caused the deaths of organ recipients from a male donor after a fatal accident?
• Which medium is primarily used for the selective recovery of Neisseria gonorrhoeae?
• Resistance to which antibiotic categorizes a strain of Staphylococcus aureus as MRSA?
• Which yeast species typically has pseudohyphae and blastoconidia that are arranged along pseudohyphae?
• Why is prompt diagnosis critical in cases of suspected viral encephalitis?
• The salt tolerance test (6.5% salt broth) is primarily used to identify which organism?
• What is the role of serotyping in clinical labs regarding Enterobacteriaceae?
• What type of staining is utilized to visualize Nocardia species under a microscope?
• Which of the following tests is routinely used to identify Staphylococcus aureus?
• The mycelial form of Histoplasma capsulatum seen on agar resembles what structure?
• Nutritionally variant streptococci (NVS) require specific nutrients. Which test fulfills this requirement?
• Which Staphylococcus species, besides Staphylococcus aureus, also produces coagulase?
• Primary infections with microsporidia may originate in which part of the body?
• What is the best method to determine if a boy has contracted rabies after exposure to wild raccoons?
• Cornmeal agar with Tween 80 is used to identify which characteristic of an unknown yeast isolate?
• What test is used to differentiate Micrococcus from Staphylococcus species?
• Which genera of Enterobacteriaceae are usually nonmotile at 36°C?
• What species of Haemophilus hemolyzes horse erythrocytes and requires hemin and NAD for growth?
• What was the most likely cause of death for the newborn treated with acyclovir who did not survive?
• What is the significance of the 'molar teeth' appearance on blood agar?
• Which reagent is used to detect the presence of indole?
• What organism is indicated by 'cup-shaped' cysts found in the lung biopsy of an immunocompromised patient?
• Which of the following is not a characteristic of anaerobic cocci?
• In addition to motility, which test best differentiates Acinetobacter spp. from Alcaligenes spp.?
• What is the most likely organism from a dog bite wound that produces yellow colonies with fingerlike projections?
• What type of colonies does Pseudomonas stutzeri produce?
• Which operculated cestode egg can be recovered from human feces?
• Which Microsporum species causes an epidemic form of tinea capitis in children?
• Before initiating antiviral therapy in an HIV-1 patient diagnosed by enzyme immunoassay and confirmed by Western blot, which laboratory test should be performed?
• What test would you perform last to differentiate Enterobacteriaceae based on urease activity?
• What aspect of culture testing limits its use for Mycoplasma pneumoniae?
• The direct spread route of pneumonic plague disease is through what means?
• In the Kauffmann-White schema, what combined antigens are used for serological identification of Salmonella spp.?
• What is the best method for recovering anaerobic bacteria from a deep abscess?
• Which organism can agglutinate in Salmonella polyvalent antiserum and may be mistaken for Salmonella?
• Which spore type and location is found on Clostridium tetani?
• Regarding organisms and their characteristics, which match is incorrect?
• A Corynebacterium species becomes a pathogen when it produces which of the following?
• What results from accidental ingestion of eggs where the human becomes an intermediate host?
• Which organism is associated with immunodeficiency syndromes and melioidosis?
• Which parasite is most likely causing symptoms in a transplant patient on steroids, originally from Central America?
• Ascospores are formed by which yeast isolate?
• What reagents are used to develop the red color in the nitrate reduction test?
• What spirochete is commonly detected in hematology laboratories before a physician suspects an infection?
• What is the primary route of transmission for schistosomiasis in humans?
• What virus is most likely responsible for gastrointestinal illness on a cruise ship?
• Which yeast produces only blastoconidia on cornmeal Tween 80 agar?
• Should a 24-hour urine specimen for mycobacteria culture be accepted if submitted by a 65-year-old female outpatient?
• Which group of tests best differentiates Helicobacter pylori and C. jejuni?
• Chocolate agar and modified Thayer-Martin agar are used for the recovery of which bacteria?
• What feature characterizes Staphylococcus epidermidis in clinical specimens?
• Which of the following genera are anaerobic cocci that stain gram positive?
• What features would help identify an organism as Burkholderia cepacia?
• A culture from a tropical fish store manager’s wound grew on Lowenstein-Jensen agar at 30C but not at 37C. What is the most likely identification?
• To recover Chlamydia spp. from genital specimens, which procedure is appropriate?
• Which Mycobacterium species produces pigmented colonies in the dark (is a scotochromogen)?
• For a patient with increasing diarrhea, which diagnostic test combination is most relevant?
• What characteristic is noted in a fungus if it is viable only in yeast phase?
• What mechanism is responsible for botulism in infants caused by Clostridium botulinum?
• A purple slant and blackened butt in lysine iron agar (LIA) indicate which bacterium?
• What is the best choice of test to differentiate Pseudomonas aeruginosa from Acinetobacter spp.?
• An organism that is positive with a modified acid-fast stain and recovered from a sputum specimen is likely which of the following?
• Which organisms are used as controls for both rapid growers and slow growers of Mycobacterium?
• What is the recommended specimen for recovering Enterobius vermicularis in pediatric patients?
• Which first-line antibiotics are used to treat classic tuberculosis and tested by disk diffusion method?
• What is the most likely organism following a leg culture that shows gram-negative rods on MacConkey agar with the given biochemical results?
• A patient exhibiting 'glanders-like' symptoms after open wounds is most likely infected with which organism?
• Which test differentiates Staphylococcus aureus from Staphylococcus intermedius?
• What does a positive result in the VP test indicate?
• Which tests are most appropriate for identifying gram-positive cocci with alpha-hemolysis in a pneumonia patient?
• What would one expect to see when examining stool material for Cytoisospora belli?
• Which organism is identified as the causative agent of Lyme disease?
• What biochemical characteristic distinguishes Salmonella from C. freundii?
• What is the most likely identification of a bacterium that exhibits small yellow colonies on blood agar, is a Gram-negative curved fusiform rod, and is catalase positive?
• Which biochemical tests are essential for identifying colorless colonies growing on MacConkey agar from a catheterized urine specimen?
• What is a common symptom associated with infections caused by pathogenic E. coli strains?
• Which enzymes contribute to the virulence of Staphylococcus aureus?
• A patient diagnosed with colon malignancy has blood cultures showing anaerobic gram-positive bacilli. What is the organism based on the described results?
• Which test is recommended for initial differentiation of Listeria monocytogenes from group B streptococci?
• An immunosuppressed man with a military history is likely infected with which organism?
• Anaerobic bacteria are routinely isolated from all of the following types of infections except:
• Kingella kingae infections are primarily associated with which condition?
• What test results are expected to confirm the identity of a suspected anaerobic bacterial infection?
• Which organism is associated with vertically transmitted infections in pregnant women at risk for complications during delivery?
• What is the optimal medium for recovering Brucella spp. from blood and bone marrow specimens?
• Which is the most appropriate nonselective medium for the recovery of mycobacteria from a heavily contaminated specimen?
• Which organism allows humans to serve as both the intermediate and definitive host?
• Which organism is identified by a bone marrow sample revealing small intracellular cells and showing a dimorphic growth phase?
• Which trichophyton species causes the favus type of tinea capitis seen in the Scandinavian countries and in the Appalachian region of the United States?
• Which organisms should be considered in a nursery school outbreak of diarrhea?
• Cetrimide agar is primarily used for the selective isolation of which organism?
• Which species of Mycobacterium is diagnosed by means other than culture?
• Which infection is commonly associated with respiratory symptoms post-seminar in a group of teachers due to a specific pathogen?
• What are the most appropriate screening tests to presumptively differentiate and identify nonfermentative gram-negative bacilli from the Enterobacteriaceae?