Microbiology

The ingredient added to enhance the recovery of the dimorphic fungi by preventing the overgrowth of saprophytic molds is

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Not all strains of Entamoeba histolytica are pathogenic. What is the non-pathogenic variant of E. histolytica?

A flagellar stain would show peritrichous flagella for each of the following organisms except:

A nosocomial infection in an 80-yr-old female, recovering from pneumonia, produced many oxidase-neg colonies on MAC.

Gray-white cob-web like mycelium with the rim of black pigmentation. Failed to convert to a yeast form @35oC. ID?

This XLD medium shown in this photo was isolated from a stool specimen of an immunocompetent adult. Your best action is:

A large, spore-forming GPB is suspected to be Bacillus sp. Which test could be used to rule out Bacillus anthracis?

Which reagent(s) is/are used to develop the red color indicative of a positive reaction in the nitrate reduction test?

Infections caused by Y. pestis are rare in the US. Those cases that do occur are most frequently located in which region

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The condition most likely to predispose a person to septicemia by viridans streptococci is:

A Gram stain of drainage from an open wound revealed GPB with spores. This would commonly rule out which organism?

Which parasite gives birth to live larvae known as microfilariae?

If a Brucella spp is suspected in blood culture, how long it should be held on a commercial blood culture system?

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All of the following parasites are correctly matched with their primary symptom, except:

Enterococcus spp are commonly resistant to all of the following antimicrobial drug types EXCEPT:

Which Aspergillus spp., recovered from sputum/bronchial mucus, is the most common cause of pulmonary aspergillosis?

The following morphologic structure identifies C. albicans and distinguishes it from most of the other Candida species.

What is the first step of the ethyl acetate concentration procedure?

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All of the following fungi are considered to cause major opportunistic infections in humans, EXCEPT?

A yellow-pigmented organism growing on CHOC, OX+, nonmotile & doesn't grow on MAC was recovered from neonate blood. ID?

Which of the following Shigella spp. serotypes is the most often isolated in the US?

What organism has a toxin that, when released, causes profuse, watery diarrhea?

In multi-drug resistant tuberculosis (MDR-TB), which drugs normally used in first-line treatment of TB are ineffective?

Which of the following tests should be incubated at 37oC in a 5-10% CO2 atmosphere?

All of the following are true concerning clinical specimens that are gram stained before culturing, EXCEPT:

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What two glycoproteins are expressed on the surface of influenza A viruses and are used for subtyping of the viruses?

P. aeruginosa was isolated&needed further eval for susceptibility. Which results would indicate a need for further eval?

Stool is the specimen of choice for the recovery of which one of the following parasites?

All of the following are accurate descriptions of the expected microscopic findings, EXCEPT:

All of the following organisms stain with an acid-fast stain, or one of its variants, EXCEPT:

The stain was prepared from a POS anaerobic blood culture bottle after 36 hrs incubation. Spores seen. Most likely ID?

A 36-yr-old woman is a known intracenous drug abuser, and gives a history of "several previous episodes of hepatitis"

The E. granulosus life cycle requires both intermediate & definitive host (dogs). What stage must be ingested by dogs?

Blood cultures were from a 20-yr-old women with severe diarrhea. Motile @RT. Urine culture showed 100,000 col/mL GNRs.

Which one of the following adult worms resides in the human intestine?

These colonies were identified as Vibrio vulnificus. The serious complication of infections with this bacterial spp is:

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Stenotrophomonas maltophilia and Burkholderia cepacia share each of the following characteristics EXCEPT:

The Western Blot for HIV-1 infection ID looks for HIV p24 and what other two protein bands to confirm HIV-1 infection?

Which organism is considered a free-living amoebae?

Alcaligenes faecalis (formerly A. odorans) is distinguished from Bordetella bronchiseptica with which test?

Since Brucella sp. are facultative intracellular organisms that infect the RES, specimens of choice for recovery include

Which of the following amoeba cysts measures approximately 25 micrometer?

The majority of H. influenzae infections are caused by which of the following capsular serotypes?

Which of the following tests best differentiates Shigella species from E. coli?

What organism produced outside a bioterrorism event causes glanders disease?

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Each of the following tests is helpful in the species identification of Staphylococcus aureus except:

Observed in a stool specimen is 8 µm cyst, 4 nuclei and their distinctive blot-like karyosomes. Most likely ID?

A very small ssDNA virus that causes a febrile illness with a rash, and is called the 5th childhood disease is:

A pair of stock culture organisms would be most suitable to verify the performance of these QC tests: PAD, Indole, VP?

A lab tech receives a VRE screening culture. Which agar should the tech use to set up the VRE screening culture?

This is an Echinococcus granulosus hydatid cyst. Identify the object(s) that arrows "B" is pointing to.

All of the following viral causative agent and associated disease state combinations are correct except:

Which of the following statements about stains is incorrect?

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All of the following statements are associated with MALDI-TOF MS used in clinical microbiology except?

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Which of the following anthrax infections is also known as "woolsorter's disease"? Specimen of choice to detect it?

Select the specimen that is inadequate for the recovery of anaerobes and should be summarily rejected

Which of the following would be the most appropriate temperature for long term storage of specimens for viral culture?

A GNCB produces small gray colonies surrounded by a zone of hemolysis on PBGA. The organism grew on CHOC but not on SBA.

Which of the following viruses requires a complex lymphoblastoid cell culture, is rarely, if ever, diagnosed by culture?

Which of the following scenarios represents appropriate detection of MRSA by the Kirby Bauer method?

Which GNB produce brown to black pigment on KVA and brick red fluorescence when exposed to an ultraviolet light source?

What are the two general categories of nucleic acid amplification (NAA) technique?

The following is a systemic, dimorphic genus that produces barrel-shaped arthroconidia separated by dysjunctor cells:

A patient is suspected of having invasive aspergillosis. Which specimen is best for the inital ID by soluble Ag testing?

This gametocyte is from which one of the following Plasmodium species?

MacConkey agar without crystal violet is a culture medium useful in the presumptive identification of:

A leg-wound culture from a hospitalized 70-year-old man with diabetes grew motile, NLF on MAC. Most probable organism?

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Which organism may be recovered from the eye of a patient suffering from keratitis?

Infections with all of the following viruses could cause malignant disease, except:

Identify the species of dimorphic fungi (in its yeast form) in this microscopic image

Many organisms as seen in the image labeled B were found in a urine specimen of a 28-yr-old male was tested. ID?

Tube A: POS tube coag test. Tube B: NEG control. The following Staph sp. may produce the reaction seen in tube A except:

This organism is very similar to Serratia marcescens, except it is DNase negative.

Trichuris trichiura belongs to which helminth group?

Which Gram-neg organism can produce "gliding motility" on agar plates an is a primary cause of juvenile periodontitis?

The Carba NP confirmatory test is used to detect all of the following carbapenemases EXCEPT?

All of the following life stages of schistosomes are appropriately matched with the host they are found in, except:

Which EBV markers would be MOST likely positive for an individual who had infectious mononucleosis nine years ago?

Which of the following would be the most appropriate temperature for long term storage of specimens for viral culture?

Which of the following protozoa has largest trophozoite?

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The most common organism that causes septic arthritis in patients under 30 years of age is:

Parasites that belong to the category Sporozoa are also known as:

Which statement is true regarding hospital-associated (HA) MRSA and community-associated (CA) MRSA?

The colonies were recovered from a blood culture of a patient with fever. The most likely source of infection is:

Which of the following Streptococcus spp. exhibits a positive bile solubility test?

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An anaerobe was recovered from a blood culture after 92 hours of incubation. The most likely identification is:

The 12 µm cyst illustrated can be identified as E. histolytica. What feature of the chromatoidal bar prompts this ID?

A GPB that has a rod-coccus cycle (thin rods in young cultures & cocci in older cultures) and an odor resembling cheese: