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NEW QUESTION # 55
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. Direct cytopathic effect of JC virus on neurons.
- C. Inflammatory demyelination triggered by JC virus infection of astrocytes.
- D. Opportunistic infection by JC virus due to impaired cell-mediated immunity.
Answer: A
NEW QUESTION # 56
The human virome, the collection of viruses that reside in and on the human body, is increasinglyrecognized for its role in health and disease. Which of the following statements regarding the human virome is MOST accurate?
- A. Bacteriophages, viruses that infect bacteria, are a significant component of the human gut virome.
- B. The human virome is primarily composed of pathogenic viruses that cause acute infections.
- C. The human virome is largely independent of the host's immune status.
- D. The composition of the human virome is relatively stable over time and is not influenced by environmental factors.
Answer: A
NEW QUESTION # 57
A research laboratory is investigating the mechanism of action of a novel antiviral drug against herpes simplex virus. The drug is found to inhibit the viral DNA polymerase. Which of the following commercially available antiviral agents has a similar mechanism of action?
- A. Oseltamivir
- B. Amantadine
- C. Acyclovir
- D. Interferon-alpha
Answer: C
NEW QUESTION # 58
A patient with a history of travel to a rural area develops a febrile illness with myalgias and thrombocytopenia. Laboratory testing reveals the presence of morulae within circulating leukocytes. The MOST likely diagnosis is:
- A. Lyme disease
- B. Babesiosis
- C. Ehrlichiosis
- D. Anaplasmosis
Answer: C
NEW QUESTION # 59
During an outbreak of norovirus gastroenteritis in a nursing home, environmental swabs are collected to identify the source of the infection. Which of the following methods would be MOST appropriate for detecting norovirus in these samples?
- A. Enzyme-linked immunosorbent assay (ELISA) for viral antigens
- B. Reverse transcription-polymerase chain reaction (RT-PCR)
- C. Culture on human embryonic kidney (HEK) cells
- D. Gram staining and microscopy
Answer: B
NEW QUESTION # 60
A patient presents with a pruritic rash consisting of raised, serpiginous tracks on their skin. The patient recently returned from a Caribbean vacation and reported walking barefoot on the beach. The MOST likely causative organism is:
- A. Larvae of Strongyloides stercoralis
- B. Pediculus humanus
- C. Sarcoptes scabiei
- D. Larvae of Ancylostoma braziliense
Answer: D
NEW QUESTION # 61
A clinical microbiology laboratory is preparing a Gram stain of a mixed bacterial culture containing both Gram-positive and Gram-negative organisms. The correct order of reagents used in the Gram staining procedure is:
- A. Safranin, crystal violet, decolorizer, iodine
- B. Decolorizer, crystal violet, iodine, safranin
- C. Crystal violet, iodine, decolorizer, safranin
- D. Iodine, crystal violet, decolorizer, safranin
Answer: C
NEW QUESTION # 62
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. Alteration of penicillin-binding proteins (PBPs).
- B. Production of beta-lactamase enzymes.
- C. Increased expression of efflux pumps.
- D. Acquisition of genes encoding aminoglycoside-modifying enzymes.
Answer: A
NEW QUESTION # 63
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. Active invasion of the oral mucosa.
- B. Production of potent extracellular enzymes.
- C. Formation of a protective biofilm on the teeth.
- D. Transient bacteremia resulting from the procedure.
Answer: D
NEW QUESTION # 64
A clinical microbiology laboratory is monitoring the emergence of antimicrobial resistance. The detection of a bacterial isolate with reduced susceptibility to multiple classes of antibiotics, often due to horizontal gene transfer of resistance determinants, is characteristic of:
- A. A multidrug-resistant (MDR) organism.
- B. An intrinsically resistant organism.
- C. A naturally competent organism.
- D. A pan-susceptible organism.
Answer: A
NEW QUESTION # 65
A clinical microbiology laboratory is performing antimicrobial susceptibility testing on a Streptococcus pneumoniae isolate using broth microdilution. The lowest concentration of antibiotic that inhibits visible growth of the organism is reported as the:
- A. Breakpoint
- B. Minimum bactericidal concentration (MBC)
- C. Zone diameter
- D. Minimum inhibitory concentration (MIC)
Answer: D
NEW QUESTION # 66
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:
- A. Mucor
- B. Fusarium
- C. Rhizopus
- D. Aspergillus
Answer: D
NEW QUESTION # 67
A researcher is investigating the mechanism of action of a novel antibacterial agent that inhibits bacterial protein synthesis. The agent binds to the 50S ribosomal subunit and prevents the translocation of peptidyl- tRNA. This mechanism of action is similar to which of the following antibiotics?
- A. Azithromycin
- B. Vancomycin
- C. Ciprofloxacin
- D. Penicillin
Answer: A
NEW QUESTION # 68
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:
- A. Amplify target DNA sequences using specific primers and thermal cycling.
- B. Detect the presence of specific antibodies produced in response to bacterial infection.
- C. Specifically bind to and cleave target DNA sequences guided by a short RNA molecule.
- D. Reverse transcribe RNA into complementary DNA.
Answer: C
NEW QUESTION # 69
A patient presents with perianal itching, particularly at night. Microscopic examination of cellophane tape preparation from the perianal area reveals oval-shaped eggs with one flattened side. The MOST likely causative organism is:
- A. Trichuris trichiura
- B. Strongyloides stercoralis
- C. Enterobius vermicularis
- D. Ascaris lumbricoides
Answer: C
NEW QUESTION # 70
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. Supportive care and monitoring for spontaneous resolution.
- C. Administration of corticosteroids to reduce inflammation.
- D. Treatment with antiviral agents such as ganciclovir or valganciclovir.
Answer: D
NEW QUESTION # 71
A patient develops a localized skin infection after being bitten by a tick. The infection is characterized by a slowly expanding erythematous rash with central clearing (erythema migrans). The MOST likely causative agent is:
- A. Rickettsia rickettsii
- B. Borrelia burgdorferi
- C. Anaplasma phagocytophilum
- D. Ehrlichia chaffeensis
Answer: B
NEW QUESTION # 72
A key virulence factor of Neisseria meningitidis that plays a major role in immune evasion and is the target for serogrouping is the:
- A. Polysaccharide capsule
- B. Lipooligosaccharide (LOS) endotoxin
- C. Pili
- D. IgA protease
Answer: A
NEW QUESTION # 73
A patient with a history of travel to a rural area develops a febrile illness with jaundice and dark urine.
Peripheral blood smear reveals intraerythrocytic parasites with a characteristic Maltese cross morphology.
The MOST likely causative agent is:
- A. Plasmodium vivax
- B. Babesia microti
- C. Plasmodium falciparum
- D. Trypanosoma brucei
Answer: B
NEW QUESTION # 74
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. Candida
- C. Fusarium
- D. Mucor or Rhizopus
Answer: D
NEW QUESTION # 75
A patient develops a severe skin infection after a puncture wound sustained while gardening. Culture of the wound exudate grows a Gram-positive, spore-forming bacillus that is anaerobic and produces a potent neurotoxin causing sustained muscle contraction. The MOST likely organism is:
- A. Bacillus anthracis
- B. Clostridium tetani
- C. Clostridium perfringens
- D. Clostridium botulinum
Answer: B
NEW QUESTION # 76
A patient develops a vesicular rash on their hands and feet, accompanied by fever and oral ulcers. The MOST likely causative agent is:
- A. Varicella-zoster virus
- B. Coxsackievirus A
- C. Herpes simplex virus
- D. Measles virus
Answer: B
NEW QUESTION # 77
A clinical microbiology laboratory is investigating a cluster of bloodstream infections caused by Staphylococcus aureus. To differentiate between community-associated (CA-MRSA) and healthcare- associated (HA-MRSA) strains, they may look for the presence of:
- A. Specific staphylococcal cassette chromosome mec (SCCmec) types, such as SCCmec IV or V inCA- MRSA.
- B. Panton-Valentine leukocidin (PVL) toxin genes, which are exclusively found in HA-MRSA.
- C. Resistance to non-beta-lactam antibiotics, which is more common in CA-MRSA.
- D. The mecA gene, which is common to both CA-MRSA and HA-MRSA.
Answer: A
NEW QUESTION # 78
Chagas disease, characterized by acute Romana's sign and potential chronic cardiac and gastrointestinal complications, is caused by which vector-borne protozoan parasite?
- A. Trypanosoma brucei gambiense
- B. Toxoplasma gondii
- C. Leishmania donovani
- D. Trypanosoma cruzi
Answer: D
NEW QUESTION # 79
Microscopic examination of a potassium hydroxide (KOH) preparation of skin scrapings from a patient with tinea versicolor typically reveals:
- A. Cigar-shaped yeast cells
- B. Broad, aseptate hyphae with sporangiophores
- C. Septate hyphae and arthroconidia
- D. Short, unbranched hyphae and globose yeast cells in clusters ("spaghetti and meatballs")
Answer: D
NEW QUESTION # 80
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