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American Society of Microbiology ASM-ABMM - Questions & Answers

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Question 1
Single choice

A research team is investigating the host immune response to Mycobacterium tuberculosis. They discover that a specific mycobacterial glycolipid inhibits the maturation of phagosomes containing the bacteria, preventing their fusion with lysosomes. This mechanism allows M. tuberculosis to:

A.

Evade detection by Toll-like receptors on macrophages.

B.

Survive and replicate within macrophages.

C.

Induce the production of pro-inflammatory cytokines.

D.

Escape from the phagolysosome into the cytoplasm.

Question 2
Single choice

Besides traditional Giemsa-stained thick and thin blood smears, which diagnostic approach is commonly employed as a rapid diagnostic test (RDT) for malaria detection, particularly in resource-limited settings?

A.

Quantitative Buffy Coat (QBC) analysis

B.

Serological detection of anti-Plasmodium IgG antibodies

C.

Immunochromatographic assays detecting Plasmodium-specific antigens (e.g., HRP2, pLDH)

D.

PCR amplification of Plasmodium 18S rRNA gene directly from saliva

Question 3
Single choice

A public health investigation is underway following several cases of encephalitis in a specific geographic region during the summer months. Mosquitoes are abundant in the area. Serological testing of patient CSF samples reveals IgM antibodies against a flavivirus. The MOST likely causative agent is:

A.

Rabies virus

B.

West Nile virus

C.

Jamestown Canyon virus

D.

Eastern equine encephalitis virus

Question 4
Single choice

A microbiology laboratory is performing antimicrobial susceptibility testing using Etest strips. The MIC value is determined by:

A.

The diameter of the zone of inhibition around the strip.

B.

The lowest concentration at which the elliptical zone of inhibition intersects the strip.

C.

The highest concentration that allows visible bacterial growth within the zone of inhibition.

D.

The presence or absence of growth at a single critical concentration.

Question 5
Single choice

A patient with a history of recurrent urinary tract infections caused by Escherichia coli develops a new infection. The urine isolate is resistant to trimethoprim-sulfamethoxazole. The MOST common mechanism of resistance to this antibiotic combination in E. coli involves:

A.

Mutations in the genes encoding dihydrofolate reductase and dihydropteroate synthase.

B.

Increased production of para-aminobenzoic acid (PABA).

C.

Expression of efflux pumps that specifically target trimethoprim and sulfamethoxazole.

D.

Enzymatic inactivation of trimethoprim and sulfamethoxazole.

Question 6
Single choice

A microbiology laboratory is investigating a possible outbreak of Salmonella infection. Serological testing of patient isolates reveals they all possess the same O antigen but different H antigens. This suggests:

A.

A single point source of infection with a genetically stable strain.

B.

Multiple sources of infection with unrelated Salmonella strains.

C.

A common ancestral strain that has undergone flagellar antigen variation.

D.

Contamination in the laboratory affecting multiple samples.

Question 7
Single choice

A clinical microbiology laboratory is performing antimicrobial susceptibility testing on a Streptococcus pneumoniae isolate recovered from a patient with meningitis. The isolate shows reduced susceptibility to penicillin (MIC = 2 /mL). The MOST likely mechanism for this reduced susceptibility is:

A.

Production of beta-lactamase enzymes that hydrolyze penicillin.

B.

Alterations in the penicillin-binding proteins (PBPs) that reduce their affinity for penicillin.

C.

Increased activity of efflux pumps that actively remove penicillin from the cell.

D.

Modification of the peptidoglycan structure, preventing penicillin binding.

Question 8
Single choice

A patient with a history of travel to Southeast Asia presents with fever, severe headache, and altered mental status. CSF analysis reveals lymphocytic pleocytosis and elevated protein, but routine bacterial and viral cultures are negative. Serological testing of CSF is positive for IgM antibodies against Japanese encephalitis virus. The MOST likely mode of transmission for this infection is:

A.

Ingestion of contaminated food or water.

B.

Respiratory droplets from an infected individual.

C.

Bite of an infected mosquito.

D.

Direct contact with infected animals.

Question 9
Single choice

Transmissible spongiform encephalopathies (TSEs), such as Creutzfeldt-Jakob disease (CJD) in humans and Bovine Spongiform Encephalopathy (BSE) in cattle, are caused by infectious agents composed primarily of:

A.

Viroids (small, circular RNA molecules)

B.

Defective viral particles requiring a helper virus

C.

Aberrantly folded host-encoded prion proteins (PrP<sup>Sc</sup>)

D.

Slow-growing bacteria lacking a cell wall

Question 10
Single choice

A clinical microbiology laboratory is validating a new point-of-care test for the rapid detection of influenza A and B viruses. To accurately determine the clinical sensitivity of the test, it should be compared to a gold standard method using:

A.

A panel of known positive and negative samples stored at room temperature.

B.

A large number of prospectively collected clinical samples from patients with suspected influenza, with results confirmed by RT-PCR.

C.

Spiked samples containing known concentrations of influenza antigens.

D.

Samples from patients with other respiratory viral infections to assess cross-reactivity.

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