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USMLE STEP 1 Microbiology Exam Prep Questions And Answers ()
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USMLE Step 1: Microbiology Exam Prep Questions And Answers(202472025)
organisms known for causing endocarditis - ✔✔S. aureus, Staph epididermis,
viridans strep, VRE, Strep. bovis, HACEK organisms
four drug regimen used to treat TB - ✔✔isoniazid, ethambutol, rifampin,
pyrazinamide
used to treat Trichomonas or Gardnerella - ✔✔metronidazole
used to treat Plasmodium vivax or ovale - ✔✔chloroquine + primaquine
used to treat Pediculosis capitis or pubus - ✔✔permethrin, pyrethrin
organisms most commonly responsible for otitis media - ✔✔Strep pneumoniae
Haemophilus influenzae
Moraxella catarrhalis
organism most commonly responsible for otitis externa - ✔✔Pseudomonas
aeruginosa
fungus that causes San Joaquin Valley fever - ✔✔Coccidioides
fungus found in rural Latin America - ✔✔Paracoccidioides
fungus associated with plant thorns and cutaneous injury - ✔✔Sporothrix
,fungus found in states east of the Mississippi River - ✔✔Blastomycosis
fungus found in bird and bat droppings - ✔✔Histoplasmosis
mold form contains barrel-shaped arthroconidia - ✔✔Coccidioides
encapsulated bacteria (8) - ✔✔E. coli, Strep pneumoniae, N. meningitidis,
Klebsiella pneumoniae, Haemophilus influenae, Pseudomonas aeruginosa,
Salmonella, group B Strep
steeple sign on X-ray - ✔✔croup, parainfluenza virus
thumb sign on x-ray - ✔✔epiglottitis, Haemophilus influenza
treatment of chronic hepatitis B and C - ✔✔IFN-alpha, ribavirin
most abundant bacteria in the colon of most individuals - ✔✔Bacteroides fragilis
likely organisms in a patient with chronic granulomatous disease - ✔✔S. aureus, E.
coli, K. pneumoniae, Aspergillus, Candida (all are catalase +)
organisms that cause infections in the mouth of AIDS patients - ✔✔HSV, C.
albicans, EBV, CMV
three structural genes that code for HIV proteins - ✔✔gag (p24)
pol (reverse transcriptase, integrase)
env (gp120, gp41)
, dark purple nodules on the skin in an HIV patient - ✔✔HHV-8, Kaposi sarcoma
large cells with owl's eye inclusions - ✔✔CMV
treatment for CMV - ✔✔ganciclovir
most common opportunistic infection in HIV patients - ✔✔Pneumocystis jirovecii
drug used to prevent Pneumocystis pneumonia - ✔✔TMP-SMX
causes hemolytic-uremic syndrome - ✔✔EHEC: 0157:H7
medications used to treat C. diff colitis - ✔✔metronidazole and oral vancomycin
food poisoning as a result of mayonnaise sitting out too long - ✔✔S. aureus
diarrhea caused by Gram (-) nonmotile organism that does not ferment lactose -
✔✔Shigella
Rice-water stools - ✔✔Vibrio cholera
Diarrhea caused by an S-shaped organism - ✔✔Campylobacter jejuni
Diarrhea transmitted from pet feces - ✔✔Yersinia enterocolitica
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