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USMLE Step 1 Exam: Questions With 100% Complete Solutions 2025|2026 Latest Update

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USMLE Step 1 Exam: Questions With 100% Complete Solutions 2025|2026 Latest Update

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USMLE Step 1 Exam: Questions With
100% Complete Solutions 2025|2026
Latest Update
Obligate anaerobes - correct answer-Actinomyces, Bacteriodes,
Clostridium




Obligate intracellular - correct answer-Rickettsia, Chlamydia




Facultative intracellular - correct answer-Salmonella, Neisseria, Brucella,
Mycobacterium, Listeria, Francisella, Legionella, Yersinia pestis




Encapsulated bacteria - correct answer-S. pneumoniae, H.influenza type
B, N.mengintitis, E.coli, Salmonella, Klebsiella pneumoniae, group B
Strep (Shine SKis)

, Catalase-positive Organisms - correct answer-Pseudomonas, Listeria,
Aspergillus, Candida, E.coli, S.aureus, Serratia maraescens, Norcardia,
Pseudomona cepacia




Urease Positive organisms - correct answer-Cryptococcus, H.pylori,
Proteus, Ureaplasma, Norcardia, Klebsiella, S.epidermideis, S.
saprophyticus




Protein A - correct answer-Binds Fc region of Ig. Prevents opsonization
and phagocytosis. Expressed by S.aureus.




IgA protease - correct answer-Enzyme that cleaves IgA. Secreted by
S.pneumoniae, H.influenza type B, Neisseria in order to colonize
respiratory mucosa (Shin)




M protein - correct answer-Helps prevent phagocytosis. Expressed by
group A streptococci.

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