Pass the American Society of Microbiology ASM-ABMM ABMM Questions and answers with ExamsMirror

A patient presents with a chronic cough, weight loss, and night sweats. Chest X-ray shows cavitarylesions in the upper lobes. Sputum is acid-fast positive. Drug susceptibility testing reveals resistance to isoniazid but susceptibility to rifampin, ethambutol, and pyrazinamide. The MOST appropriate treatment regimen should include:

A microbiology laboratory is performing Gram staining on a bacterial smear. If the safranin counterstain is omitted, Gram-negative bacteria will appear:

A researcher is studying the genetic relatedness of different isolates of Mycobacterium tuberculosis. Which of the following molecular typing methods provides the highest discriminatory power for distinguishing between closely related strains?

A clinical microbiology laboratory is preparing to validate a new molecular assay for the detection of methicillin-resistant Staphylococcus aureus (MRSA). To assess the positive predictive value (PPV) of the assay, they need to know:

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 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 µg/mL). The MOST likely mechanism for this reduced susceptibility is:

The azole class of antifungal agents (e.g., fluconazole, voriconazole) exerts its effect primarily by inhibiting which fungal-specific enzyme involved in membrane synthesis?

A patient with a history of neutropenia following chemotherapy develops a severe pneumonia. Bronchoalveolar lavage fluid reveals the presence of hyaline, septate hyphae with frequent dichotomous branching at acute angles. Culture yields a filamentous fungus that produces conidiophores with a vesicle bearing phialides that release chains of conidia. The MOST likely genus is:

Which pattern on a Kirby-Bauer disk diffusion plate, showing resistance of Staphylococcus aureus to erythromycin but susceptibility to clindamycin with a flattening of the clindamycin zone adjacent to the erythromycin disk (D-zone test positive), indicates inducible clindamycin resistance?

A clinical trial is evaluating the efficacy of a new antifungal agent against invasive aspergillosis. Serum galactomannan levels are being used as a biomarker to monitor the infection. A decrease in galactomannan levels during treatment would indicate: