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USMLE
USMLE Review 3 Exam Questions
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1. Small inoculum causes bacteria (5) - ANS ✓Shigella flexneri, C.
Jejuni, Entamoeba, Giardia)
2. Mucicarmine staining - ANS ✓Cryptococcus neoformans in tissue,
India Ink of CSF
3. Schistosoma (snail reservoir) - ANS ✓African vacation, bathing in
lakes, bilateral hydronephrosis and bladder wall thickening
4. Shigella and Shiga-like toxins - MOA - ANS ✓inhibit 60s ribosome
preventing binding of trna
5. H. Flu infection despite being vaccinated - ANS ✓H. Flu
responsible do not produce capsule, not Hib vaccine type
6. Meningococcal virulence - ANS ✓LOS - correlate with morbidity
and mortality
7. Congenital toxo triad - ANS ✓hydrocephalus, chorioretinitis,
calcifications
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USMLE
8. Botulism nerve signs - ANS ✓decreased compound action potential,
normal nerve conduction velocity
9. Acid lable picornavirus - ANS ✓rhinovirus (naked, like all picornas)
PAPP and CPR Hep (Calcivirus, Picorna, Reovirus, Hepevirus)
10. C. Diptheriae agar - ANS ✓cysteine-tellurite
11. Killed Vaccines - ANS ✓Cholera, Hepatitis A, Polio (Salk),
Rabies
12. Live Vaccines - ANS ✓Measles, mumps, rubella, polio (Sabin),
varicella, yellow fever, smallpox, inhaled influenza
13. Scarlet Fever presentation - ANS ✓fever, pharyngitis,
sandpaper-liker rash, pallor, bright red strawberry tongue = Group A
strep = acute rheumatic fever, glomerulonephritis
14. Fever, nasal discharge, lacrimation, dry cough, small white
spots with erythematous base on buccal mucosa - ANS ✓Measles
(Rubeola)
15. Mycoplasma pneumonia and which Ab - ANS ✓Cold
agglutinins = cross react with M. Pneumo and RBC
16. HIV proteins - ANS ✓gag, pol, env; env = cleaved to form
gp120, gp41
17. Fever, headache, confusion, watery diarrhea, Gram = no
bugs, many neutrophils - ANS ✓Legionella (treat with
fluoroquinolones or macrolides)
USMLE Review 3