ASM-ABMM Exam Details

  • Exam Code
    :ASM-ABMM
  • Exam Name
    :American Board of Medical Microbiology
  • Certification
    :American Society of Microbiology Certifications
  • Vendor
    :American Society of Microbiology
  • Total Questions
    :202 Q&As
  • Last Updated
    :May 26, 2026

American Society of Microbiology ASM-ABMM Online Questions & Answers

  • Question 141:

    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 142:

    A patient with a history of intravenous drug use develops a bloodstream infection with Staphylococcus aureus. Antimicrobial susceptibility testing reveals resistance to methicillin. The mechanism of methicillin resistance in Staphylococcus aureus is primarily mediated by:

    A. Production of beta-lactamase enzymes.
    B. Alteration of penicillin-binding proteins (PBPs).
    C. Increased expression of efflux pumps.
    D. Acquisition of genes encoding aminoglycoside-modifying enzymes.

  • Question 143:

    The gut microbiome has been implicated in the pathogenesis of autoimmune diseases. Dysbiosis, a disruption in the composition and function of the gut microbiota, can lead to increased intestinal permeability and the translocation of microbial products that trigger inflammatory responses. Which of the following bacterial components is a potent activator of the innate immune system and has been linked to the development of autoimmunity?

    A. Lipoteichoic acid (LTA)
    B. Peptidoglycan
    C. Lipopolysaccharide (LPS)
    D. Flagellin

  • Question 144:

    A microbiology laboratory is processing a stool sample for ova and parasites. A large (approximately 100 A. Ascaris lumbricoides
    B. Enterobius vermicularis
    C. Taenia species
    D. Trichuris trichiura

  • Question 145:

    A key virulence factor of Neisseria meningitidis that plays a major role in immune evasion and is the target for serogrouping is the:

    A. Pili
    B. Lipooligosaccharide (LOS) endotoxin
    C. IgA protease
    D. Polysaccharide capsule

  • Question 146:

    A microbiology laboratory is asked to identify the causative agent of a fungal keratitis. Microscopic examination of corneal scrapings reveals broad, aseptate hyphae with right- angle branching. The MOST likely genus is:

    A. Aspergillus
    B. Fusarium
    C. Mucor or Rhizopus
    D. Candida

  • Question 147:

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

    A. West Nile virus
    B. Rabies virus
    C. Herpes simplex virus encephalitis
    D. Japanese encephalitis virus

  • Question 148:

    A patient with a history of recurrent sinopulmonary infections and bronchiectasis is diagnosed with primary ciliary dyskinesia. Sputum cultures are most likely to persistently grow which of the following organisms?

    A. Streptococcus pneumoniae
    B. Haemophilus influenzae
    C. Pseudomonas aeruginosa
    D. Moraxella catarrhalis

  • Question 149:

    A previously healthy 28-year-old female develops a severe, watery diarrhea after attending a picnic where she consumed potato salad that had been left unrefrigerated for several hours. Stool culture reveals numerous Gram-positive bacilli. Further biochemical testing shows the organism is beta-hemolytic on blood agar and produces a heat-stable enterotoxin. The MOST likely causative agent is:

    A. Bacillus cereus
    B. Clostridium difficile
    C. Staphylococcus aureus
    D. Vibrio cholerae

  • Question 150:

    A patient with a history of travel to a tropical region presents with cyclical fevers and chills.Peripheral blood smear reveals the presence of merozoites and schizonts within erythrocytes. The absence of crescent-shaped gametocytes makes Plasmodium falciparum less likely. The MOST probable species is:

    A. Plasmodium vivax
    B. Plasmodium ovale
    C. Plasmodium malariae
    D. Plasmodium knowlesi

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