DumpsReview ABMM Real Exam Question Answers Updated [Mar 08, 2026]
Easily To Pass New American Society of Microbiology ABMM Dumps with 204 Questions
NEW QUESTION # 46
During the investigation of a foodborne illness outbreak linked to raw sprouts, several bacterial isolates are obtained from patient stool samples and the implicated food source. Which of the following molecular methods would be MOST useful for establishing a definitive link between the clinical isolates and the food isolate?
- A. Pulsed-field gel electrophoresis (PFGE)
- B. Serotyping based on O and H antigens
- C. Gram staining and biochemical profiling
- D. Antimicrobial susceptibility testing
Answer: A
NEW QUESTION # 47
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. Trichuris trichiura
- B. Enterobius vermicularis
- C. Ascaris lumbricoides
- D. Taenia species
Answer: C
NEW QUESTION # 48
Lyme disease, characterized initially by erythema migrans, is caused by Borrelia burgdorferi. What is the primary arthropod vector responsible for transmitting this spirochete to humans in the Northeastern United States?
- A. Pulex irritans (Human flea)
- B. Ixodes scapularis (Blacklegged tick)
- C. Dermacentor variabilis (American dog tick)
- D. Amblyomma americanum (Lone Star tick)
Answer: B
NEW QUESTION # 49
A clinical microbiology laboratory is using PCR to detect the presence of the mecA gene in Staphylococcus aureus isolates. The mecA gene encodes for:
- A. An aminoglycoside-modifying enzyme
- B. An efflux pump protein
- C. Beta-lactamase enzyme
- D. Altered penicillin-binding protein (PBP2a)
Answer: D
NEW QUESTION # 50
A patient with HIV infection and a CD4+ T-cell count below 50 cells/µL develops a progressive neurological illness characterized by confusion, motor deficits, and seizures. Brain MRI reveals multiple white matter lesions without mass effect. PCR of the CSF is positive for JC virus. Thepathogenesis of this condition, progressive multifocal leukoencephalopathy (PML), involves:
- A. Lytic infection of oligodendrocytes by JC virus, leading to demyelination.
- B. Opportunistic infection by JC virus due to impaired cell-mediated immunity.
- C. Direct cytopathic effect of JC virus on neurons.
- D. Inflammatory demyelination triggered by JC virus infection of astrocytes.
Answer: A
NEW QUESTION # 51
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. Respiratory droplets from an infected individual.
- B. Bite of an infected mosquito.
- C. Ingestion of contaminated food or water.
- D. Direct contact with infected animals.
Answer: B
NEW QUESTION # 52
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. Cryptococcus gattii
- C. Candida glabrata
- D. Saccharomyces cerevisiae
Answer: A
NEW QUESTION # 53
A patient develops a vesicular rash on their hands and feet, accompanied by fever and oral ulcers. The MOST likely causative agent is:
- A. Herpes simplex virus
- B. Measles virus
- C. Varicella-zoster virus
- D. Coxsackievirus A
Answer: D
NEW QUESTION # 54
A patient with HIV infection and a low CD4+ T-cell count presents with fever, weight loss, and cough. Chest X-ray shows diffuse interstitial infiltrates. Sputum induction reveals oval yeast cells with narrow-based budding. The MOST likely diagnosis is:
- A. Pneumocystis pneumonia
- B. Tuberculosis
- C. Cryptococcosis
- D. Histoplasmosis
Answer: D
NEW QUESTION # 55
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. Moraxella catarrhalis
- B. Haemophilus influenzae
- C. Streptococcus pneumoniae
- D. Legionella pneumophila
Answer: B
NEW QUESTION # 56
A patient develops a febrile illness with jaundice and dark urine after receiving a blood transfusion.
Laboratory testing reveals an elevated level of unconjugated bilirubin and a positive direct Coombs test.
Serological testing is positive for antibodies against a protozoan parasite that infects erythrocytes. The MOST likely causative agent is:
- A. Babesia microti
- B. Plasmodium falciparum
- C. Toxoplasma gondii
- D. Trypanosoma cruzi
Answer: A
NEW QUESTION # 57
A patient with a history of solid organ transplantation develops a severe respiratory illness. Bronchoalveolar lavage fluid is positive for cytomegalovirus (CMV) DNA by PCR, and cytological examination reveals characteristic "owl's eye" inclusions in enlarged cells. The MOST appropriate management strategy for this patient would include:
- A. Initiation of broad-spectrum antibiotics to cover potential bacterial coinfections.
- B. Administration of corticosteroids to reduce inflammation.
- C. Treatment with antiviral agents such as ganciclovir or valganciclovir.
- D. Supportive care and monitoring for spontaneous resolution.
Answer: C
NEW QUESTION # 58
A child presents with a characteristic "slapped cheek" rash followed by a lacy, reticular rash on the trunk and extremities. The causative agent is a single-stranded DNA virus belonging to the family Parvoviridae, known as:
- A. Rubella virus
- B. Measles virus
- C. Human parvovirus B19
- D. Roseola virus (HHV-6)
Answer: C
NEW QUESTION # 59
A clinical microbiology laboratory is using a nucleic acid amplification test (NAAT) to detect Mycobacterium tuberculosis directly from sputum. A positive result indicates:
- A. Drug susceptibility information for the M. tuberculosis strain.
- B. The presence of M. tuberculosis DNA, which could be from viable or non-viable organisms.
- C. Active tuberculosis disease requiring immediate treatment.
- D. The presence of viable M. tuberculosis organisms.
Answer: B
NEW QUESTION # 60
For epidemiological tracking and outbreak investigations of Clostridioides difficile infection (CDI), which molecular typing method based on PCR amplification targeting repetitive elements within the pathogenicity locus (PaLoc) has historically been widely used and designated by specific nomenclature (e.g., NAP1/BI
/027)?
- A. PCR Ribotyping
- B. Multilocus sequence typing (MLST)
- C. Whole-genome sequencing (WGS) SNP analysis
- D. Pulsed-field gel electrophoresis (PFGE)
Answer: A
NEW QUESTION # 61
A patient develops a localized skin infection characterized by a painless, progressive ulcer with raised, indurated margins. Microscopic examination of tissue scrapings reveals amastigotes within macrophages. The patient reports recent travel to Central or South America. The MOST likely diagnosis is cutaneous:
- A. Chromoblastomycosis
- B. Myiasis
- C. Leishmaniasis
- D. Sporotrichosis
Answer: C
NEW QUESTION # 62
A clinical laboratory manager is implementing a new automated blood culture system. Which aspect is LEAST likely to be part of the initial verification/validation process before clinical use?
- A. Assessment of the system's contamination rate over one year of routine use
- B. Verification of detection of a panel of common bloodstream pathogens
- C. Establishing workflow and training competency for laboratory staff
- D. Comparison of time-to-detection with the previous system
Answer: A
NEW QUESTION # 63
Metagenomic analysis of a bronchoalveolar lavage (BAL) sample from a patient with severe pneumonia reveals a complex microbial community with a high abundance of both bacterial and fungal sequences. This approach is particularly useful in identifying:
- A. The presence of specific virulence factors expressed by the identified pathogens.
- B. The specific antibiotic susceptibility profile of the predominant bacterial pathogen.
- C. The presence of fastidious or unculturable pathogens that may be missed by traditional methods.
- D. The relative proportions of different immune cell populations in the BAL fluid.
Answer: C
NEW QUESTION # 64
A diagnostic laboratory is validating a new multiplex PCR panel for respiratory pathogens. According to CLIA regulations, which of the following parameters must be established by the laboratory performing the validation for this qualitative nucleic acid amplification test?
- A. Precision, Reportable Range, Analytical Specificity, Reference Interval
- B. Accuracy, Precision, Clinical Sensitivity, Clinical Specificity
- C. Accuracy, Precision, Reportable Range, Analytical Sensitivity
- D. Accuracy, Precision, Analytical Sensitivity, Analytical Specificity (including cross-reactivity)
Answer: D
NEW QUESTION # 65
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. A mixed infection in the original patient sample.
- C. Cross-reactivity of the PCR primers with Streptococcus pneumoniae DNA.
- D. Degradation of the rhinovirus target sequence during storage.
Answer: C
NEW QUESTION # 66
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. Pseudomonas aeruginosa
- B. Moraxella catarrhalis
- C. Haemophilus influenzae
- D. Streptococcus pneumoniae
Answer: C
NEW QUESTION # 67
Microscopic examination of a trichrome-stained stool smear reveals amoebic trophozoites approximately 25
µm in diameter, containing ingested red blood cells. The nucleus, when visible, has fine, evenly distributed peripheral chromatin and a small, central karyosome. These features are diagnostic for:
- A. Iodamoeba bütschlii
- B. Entamoeba histolytica
- C. Endolimax nana
- D. Entamoeba coli
Answer: B
NEW QUESTION # 68
A patient with a history of valvular heart disease undergoes a dental procedure and subsequently develops a bloodstream infection with Streptococcus mutans. This organism gains access to the bloodstream primarily due to:
- A. Transient bacteremia resulting from the procedure.
- B. Production of potent extracellular enzymes.
- C. Active invasion of the oral mucosa.
- D. Formation of a protective biofilm on the teeth.
Answer: A
NEW QUESTION # 69
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