ASM-ABMM ABMM Dumps Full Questions with Free PDF Questions to Pass [Q43-Q67]

QUESTION 43
A clinical microbiology laboratory is performing antimicrobial susceptibility testing using the broth microdilution method. The minimum bactericidal concentration (MBC) is determined by:

QUESTION 44
A patient develops a severe gastrointestinal illness after consuming undercooked poultry. Stool culture yields a Gram-negative, microaerophilic, curved bacillus that is oxidase-positive. The MOST likely organism is:

QUESTION 45
A clinical microbiology laboratory is using flow cytometry to analyze lymphocyte subsets in a patient with suspected immunodeficiency. Which of the following cell surface markers is typically used to identify helper T cells?

QUESTION 46
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:

QUESTION 47
A microbiology laboratory is performing Gram staining on a bacterial smear. If the safranin counterstain is omitted, Gram-negative bacteria will appear:

QUESTION 48
A patient presents with a chronic, non-healing skin ulcer in a tropical region. Microscopic examination of a biopsy reveals amastigotes within macrophages. Culture of the biopsy on Novy-MacNeal-Nicolle (NNN) medium yields flagellated promastigotes. The MOST likely diagnosis is cutaneous leishmaniasis caused by:

QUESTION 49
A clinical microbiology laboratory isolates a Gram-negative rod from a wound infection following a dog bite.
The organism grows on MacConkey agar, is oxidase-positive, and produces a characteristic bleach-like odor.
The MOST likely identification is:

QUESTION 50
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?

QUESTION 51
A clinical microbiology laboratory is implementing a new multiplex nucleic acid amplification test (NAAT) for the detection of respiratory viral pathogens. To ensure the quantitative accuracy of the assay, it is essential to include:

QUESTION 52
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:

QUESTION 53
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:

QUESTION 54
A traveler returning from a tropical region presents with fever, chills, and jaundice. Peripheral blood smear reveals the presence of ring-shaped parasites within erythrocytes. Further laboratory testing shows a positive result for Plasmodium falciparum histidine-rich protein 2 (HRP2). The MOST appropriate treatment for this patient is:

QUESTION 55
A microbiology laboratory receives a blood culture from a patient with suspected bacterial endocarditis. After
24 hours of incubation, Gram-positive cocci in clusters are observed on the Gram stain. Catalase test is positive, and coagulase test is negative. Further testing reveals susceptibility to novobiocin. The MOST likely organism is:

QUESTION 56
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?

QUESTION 57
A patient with a history of exposure to bats in a cave develops progressive neurological symptoms, including hydrophobia. The MOST likely viral etiology is:

QUESTION 58
A clinical isolate of Klebsiella pneumoniae from a patient with a refractory urinary tract infection exhibits resistance to carbapenems (imipenem, meropenem, ertapenem). PCR analysis reveals the presence of the blaKPC gene. Which of the following enzymatic mechanisms is responsible for this resistance?

QUESTION 59
A clinical microbiology laboratory is investigating a potential outbreak of a highly contagious respiratory virus. To rapidly screen a large number of nasopharyngeal swabs, the MOST appropriate initial diagnostic test would be:

QUESTION 60
A research laboratory is investigating the quorum sensing system in Pseudomonas aeruginosa. They identify a novel autoinducer molecule and a corresponding transcriptional regulator. Disruption of the gene encoding this regulator leads to a significant decrease in the production of virulence factors such as elastase and pyocyanin. Further analysis reveals that this regulator directly binds to the promoter regions of these virulence genes in the presence of the autoinducer. This regulatory mechanism is an example of:

QUESTION 61
A patient with AIDS develops a disseminated fungal infection. Blood cultures grow a yeast that produces pseudohyphae and terminal chlamydospores on cornmeal agar. The patient’s CD4+ T-cell count is below 50 cells/µL. The MOST likely causative organism is:

QUESTION 62
A patient develops a severe skin and soft tissue infection following a boating accident in the Gulf Coast.
Wound cultures grow a Gram-negative, halophilic bacterium that is oxidase-positive. The MOST likely organism is:

QUESTION 63
A clinical microbiology laboratory is using PCR to detect the presence of the mecA gene in Staphylococcus aureus isolates. The mecA gene encodes for:

QUESTION 64
A clinical microbiology laboratory is investigating a potential outbreak of Legionella pneumophila associated with a hospital’s water system. The MOST appropriate environmental samples to collect for culture and comparison to clinical isolates would be:

QUESTION 65
Which of the following bacterial genera inherently possesses D-alanyl-D-lactate peptide subunits in its peptidoglycan precursors, conferring natural, high-level resistance to vancomycin?

QUESTION 66
A patient with a history of inflammatory bowel disease is diagnosed with primary sclerosing cholangitis and undergoes liver transplantation. Post-transplant, they develop a bloodstream infection with a Gram-negative bacterium that is identified as Fusobacterium nucleatum. This organism’s role in the pathogenesis of colorectal cancer is primarily attributed to its ability to:

QUESTION 67
A clinical microbiology laboratory is using CRISPR-based technology for rapid and sensitive detection of specific bacterial DNA sequences directly from patient samples. This method relies on the ability of the Cas enzyme to: