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USMLE STEP 1: MICROBIOLOGY EXAM 2024/2025
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USMLE STEP 1: MICROBIOLOGY EXAM 2024/2025
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USMLE STEP 1: MICROBIOLOGY EXAM 2024/2025organisms known for causing endocarditis-Answer Staphylococcus
aureus
Staph epididermis
viridans strep
VRE
Strep. bovis
HACEK organisms
Mycobacterium tuberculosis
4 drug treatment regimen-Answer isoniazid, ethambutol, rifampin,
pyrazinamide
used to treat Trichomonas or Gardnerella-Answer Metronidazole
used to treat Plasmodium vivax or ovale-Answer chloroquine +
primaquine
used to treat Pediculosis capitis or pubus-Answer permethrin, pyrethrin
organisms most commonly responsible for otitis media-Answer Strep
pneumoniae
,Haemophilus influenzae
Moraxella catarrhalis
Otitis Externa
Most Common Cause-Answer Pseudomonas aeruginosa
fungus that causes San Joaquin Valley fever-Answer Coccidioides
fungus found in rural Latin America-Answer Paracoccidioides
fungus associated with plant thorns and cutaneous injury-Answer
Sporothrix
fungus found in states east of the Mississippi River-Answer
Blastomycoses
fungus found in bird and bat droppings-Answer Histoplasmosis
mold form contains barrel-shaped arthroconidia-Answer Coccidioides
encapsulated bacteria (8)-Answer E. coli
Strep pneumoniae
N. meningitidis
Klebsiella pneumoniae
,Haemophilus influenae
Pseudomonas aeruginosa
Salmonella
group B Strep
steeple sign on X-ray-Answer Parainfluenza
Croup
thumb sign on x-ray-Answer Epiglottitis
Haemophilus influenza
treatment of chronic hepatitis B and C-Answer IFN-alpha, ribavirin
most abundant bacteria in the colon of most individuals-Answer
Bacteroides fragilis
likely organisms in a patient with chronic granulomatous disease-
Answer Staphylococcus aureus
E. coli
K. pneumoniae
Aspergillus
Candida
(all are catalase +)
, organisms that cause infections in the mouth of AIDS patients-Answer
HSV, C. albicans, EBV, CMV
three structural genes that code for HIV proteins-Answer gag (p24)
pol (reverse transcriptase, integrase)
env (gp120, gp41)
dark purple nodules on the skin in an HIV patient-Answer HHV-8,
Kaposi sarcoma
CMV treatment-Answer Ganciclovir
Opportunistic infection in HIV patients
Most Common-Answer Pneumocystis jirovecii
drug used to prevent Pneumocystis pneumonia-Answer TMP-SMX
causes hemolytic-uremic syndrome-Answer EHEC: 0157:H7
medications used to treat C. diff colitis-Answer Metronidazole
oral Vancomycin
food poisoning as a result of mayonnaise sitting out too long-Answer
Staphylococcus aureus
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