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NEW QUESTION # 86
Which of the following viruses is an enveloped, double-stranded DNA virus known to cause latent infections often reactivated during immunosuppression?
- A. Cytomegalovirus (CMV)
- B. Rotavirus
- C. Poliovirus
- D. Influenza A virus
Answer: A
NEW QUESTION # 87
A research laboratory is investigating the mechanism of action of a novel antiviral compound that inhibits the replication of a specific RNA virus. They find that the compound binds directly to the viral RNA-dependent RNA polymerase, preventing its elongation activity. This mechanism is most similar to that of:
- A. Interferon-beta
- B. Acyclovir
- C. Ribavirin
- D. Oseltamivir
Answer: C
NEW QUESTION # 88
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. Isoniazid and rifampin
- B. Isoniazid, rifampin, pyrazinamide, and ethambutol
- C. Isoniazid, ethambutol, and pyrazinamide
- D. Rifampin, ethambutol, and pyrazinamide
Answer: D
NEW QUESTION # 89
A research laboratory is investigating the development of a broadly protective vaccine against coronaviruses.
They are focusing on conserved epitopes in the spike (S) protein that are accessible to neutralizing antibodies across different beta-coronaviruses. Which region of the S protein is considered a promising target for such a vaccine?
- A. The S1 subunit, which is primarily responsible for host cell receptor binding.
- B. The S2 subunit, which is more conserved and mediates membrane fusion.
- C. The receptor-binding domain (RBD), which exhibits high sequence variability.
- D. The N-terminal domain (NTD) of the S protein.
Answer: B
NEW QUESTION # 90
A patient with a history of chronic obstructive pulmonary disease (COPD) experiences an acute exacerbation.
Sputum culture grows numerous Gram-negative coccobacilli that are oxidase-positive and grow on chocolate agar but not on sheep blood agar. The MOST likely organism is:
- A. Legionella pneumophila
- B. Streptococcus pneumoniae
- C. Moraxella catarrhalis
- D. Haemophilus influenzae
Answer: D
NEW QUESTION # 91
A clinical microbiology laboratory is monitoring the emergence of resistance to colistin in Gram-negative bacteria. Resistance to colistin is often mediated by modifications of the bacterial lipopolysaccharide (LPS).
The genetic basis for acquired colistin resistance most commonly involves:
- A. Mutations in genes encoding enzymes that modify the lipid A component of LPS.
- B. Alterations in the outer membrane porin proteins, reducing colistin uptake.
- C. Acquisition of genes encoding efflux pumps that specifically target colistin.
- D. Production of enzymes that directly inactivate the colistin molecule.
Answer: A
NEW QUESTION # 92
A 55-year-old male with a history of poorly controlled diabetes mellitus develops a necrotizing fasciitis of his left lower extremity following a minor abrasion sustained while gardening. Initialcultures of the wound reveal a polymicrobial flora, including Gram-positive cocci in chains and Gram-negative bacilli. Over the next 48 hours, despite broad-spectrum antibiotic therapy, the patient's condition deteriorates, and new bullae with hemorrhagic fluid appear. Gram stain of this fluid now predominantly shows large, Gram-positive bacilli with subterminal spores. Which of the following virulence factors is MOST likely contributing to the rapid tissue destruction observed in this patient?
- A. Protein A
- B. Lecithinase (alpha-toxin)
- C. Lipopolysaccharide (LPS)
- D. Exotoxin B (SpeB)
Answer: B
NEW QUESTION # 93
A patient with HIV infection and a very low CD4+ T-cell count develops a disseminated infection with a fungus that is commonly found in pigeon droppings. The MOST likely causative agent is:
- A. Cryptococcus neoformans
- B. Saccharomyces cerevisiae
- C. Cryptococcus gattii
- D. Candida glabrata
Answer: A
NEW QUESTION # 94
An immunocompromised patient develops a disseminated fungal infection. Tissue biopsy reveals small (2-4
µm) yeast cells within macrophages. The patient has a history of living in the Ohio and Mississippi River valleys. The MOST likely causative agent is:
- A. Histoplasma capsulatum
- B. Blastomyces dermatitidis
- C. Penicillium marneffei
- D. Paracoccidioides brasiliensis
Answer: A
NEW QUESTION # 95
A patient with a history of chronic sinusitis develops a severe invasive fungal infection involving the nasal sinuses and extending into the orbit. Tissue biopsy reveals broad, aseptate hyphae with irregular branching.
The patient is diabetic and acidotic. The MOST likely causative organism belongs to the genus:
- A. Fusarium
- B. Scedosporium
- C. Aspergillus
- D. Mucor or Rhizopus
Answer: D
NEW QUESTION # 96
A Gram stain of anaerobic growth from a peritoneal fluid abscess reveals pleomorphic, pale-staining Gram- negative rods. The isolate grows on Bacteroides Bile Esculin (BBE) agar, hydrolyzing esculin (producing black colonies), and is resistant to kanamycin (1000 µg), vancomycin (5 µg), and colistin (10 µg) disks. Which organism group is most likely?
- A. Prevotella melaninogenica group
- B. Bacteroides fragilis group
- C. Fusobacterium nucleatum
- D. Clostridium perfringens
Answer: B
NEW QUESTION # 97
A clinical microbiology laboratory is implementing a new MALDI-TOF mass spectrometry system for bacterial identification. For accurate identification, the system relies on comparing the protein profile of an unknown isolate to:
- A. A database of bacterial cell wall lipid compositions.
- B. A database of antibiotic resistance genes.
- C. A database of known bacterial ribosomal RNA sequences.
- D. A database of protein mass spectra from well-characterized organisms.
Answer: D
NEW QUESTION # 98
A clinical microbiology laboratory is investigating a cluster of Clostridium difficile infections in a hospital.
Which of the following methods is MOST appropriate for determining if the isolates from different patients are related?
- A. Molecular typing (e.g., PCR ribotyping)
- B. Enzyme immunoassay for C. difficile toxins
- C. Gram staining and morphology
- D. Antimicrobial susceptibility testing
Answer: A
NEW QUESTION # 99
A microbiology laboratory is processing a stool sample for ova and parasites. A large (approximately 100
µm), thick-shelled, oval egg with a flattened side is observed. This egg MOST likely belongs to:
- A. Ascaris lumbricoides
- B. Enterobius vermicularis
- C. Taenia species
- D. Trichuris trichiura
Answer: A
NEW QUESTION # 100
A microbiology laboratory is processing a sputum sample from a patient with chronic cough and night sweats.
After Ziehl-Neelsen staining, acid-fast bacilli are observed. Culture on Lowenstein-Jensen medium is positive after several weeks. Drug susceptibility testing reveals resistance to isoniazid and rifampin. This patient is MOST likely infected with:
- A. Multidrug-resistant Mycobacterium tuberculosis
- B. Actinomyces israelii
- C. Nocardia asteroides
- D. Mycobacterium avium complex
Answer: A
NEW QUESTION # 101
A patient undergoing chemotherapy for leukemia develops a severe pneumonia. Bronchoalveolar lavage fluid is examined, revealing numerous cysts containing crescent-shaped structures upon silver staining. The patient's CD4+ T-cell count is significantly low. The MOST likely diagnosis is infection with:
- A. Histoplasma capsulatum
- B. Blastomyces dermatitidis
- C. Pneumocystis jirovecii
- D. Coccidioides immitis
Answer: C
NEW QUESTION # 102
A microbiology laboratory is performing antimicrobial susceptibility testing using the Kirby-Bauer disk diffusion method. A bacterial isolate shows no zone of inhibition around a specific antibiotic disk. This result could be due to:
- A. All of the above.
- B. Intrinsic resistance of the organism to the antibiotic.
- C. The antibiotic disk being stored improperly.
- D. The use of an incorrect inoculum density.
Answer: A
NEW QUESTION # 103
A clinical microbiology laboratory is evaluating a new multiplex PCR assay for the detection of respiratory viruses. To assess the assay's specificity, they test a panel of samples known to contain various bacterial pathogens. A positive result is obtained for rhinovirus in a sample containing only Streptococcus pneumoniae.
This indicates:
- A. Poor analytical sensitivity of the PCR assay for rhinovirus.
- B. Degradation of the rhinovirus target sequence during storage.
- C. A mixed infection in the original patient sample.
- D. Cross-reactivity of the PCR primers with Streptococcus pneumoniae DNA.
Answer: D
NEW QUESTION # 104
A research team is investigating the development of a novel vaccine against influenza virus. They are focusing on conserved epitopes within the hemagglutinin (HA) and neuraminidase (NA) proteins to elicit broadly neutralizing antibodies. Which of the following approaches is MOST likely to achieve this goal?
- A. Administering high doses of inactivated influenza vaccine annually.
- B. Developing a live-attenuated influenza vaccine containing multiple serotypes.
- C. Utilizing a recombinant viral vector to deliver conserved epitopes of HA and NA.
- D. Designing a subunit vaccine that presents highly variable regions of HA and NA.
Answer: C
NEW QUESTION # 105
A 6-year-old child presents with a pharyngitis characterized by a grayish-white pseudomembrane covering the tonsils and posterior pharynx. Gram stain of the membrane reveals Gram-positive bacilli. Culture on Loeffler's medium shows growth of metachromatic granules. The MOST significant virulence factor associated with this organism's pathogenicity is:
- A. Protein A
- B. Diphtheria toxin
- C. Streptolysin O
- D. Hyaluronidase
Answer: B
NEW QUESTION # 106
In a clinical microbiology laboratory, quality control testing of Mueller-Hinton agar used for disk diffusion susceptibility testing involves checking the zone sizes for E. coli ATCC 25922, S. aureus ATCC 25923, and
P. aeruginosa ATCC 27853. What is the primary purpose of including P. aeruginosa ATCC 27853 in this QC?
- A. To verify the performance of cell wall active agents like penicillin
- B. To ensure appropriate concentration of calcium and magnesium ions affecting aminoglycoside activity
- C. To assess the performance of agents primarily active against Gram-positive organisms
- D. To confirm the correct pH of the agar medium
Answer: B
NEW QUESTION # 107
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