WBR0051

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Author PageAuthor::William J Gibson
Exam Type ExamType::USMLE Step 1
Main Category MainCategory::Microbiology
Sub Category SubCategory::Genitourinary, SubCategory::General Principles, SubCategory::Infectious Disease
Prompt [[Prompt::A 22 year old woman presents to her primary care physician complaining of dysuria for the past 3 days with mild discharge. Her last unprotected sexual encounter was 2 weeks ago. Gram stain of the urethral swab reveals Gram-Negative diplococci. Which of the following media could be used to isolate this organism?]]
Answer A AnswerA::Thayer-Martin
Answer A Explanation AnswerAExp::Correct - See explanation
Answer B AnswerB::Maconkey’s Agar
Answer B Explanation AnswerBExp::Incorrect - Maconkey’s agar is used to culture a variety of organisms. Lactose-fermenting enterics (eg E.Coli) will appear as pink colonies.
Answer C AnswerC::Tellurite Agar
Answer C Explanation AnswerCExp::Incorrect - Tellurite agar can be use to culture Corynebacterium Diptheria.
Answer D AnswerD::Bordet-Genou Agar
Answer D Explanation AnswerDExp::Incorrect - Bordet-Genou agar is used to culture Bordetella Pertussis.
Answer E AnswerE::Sabouraud’s
Answer E Explanation AnswerEExp::Incorrect - Sabouraud’s agar is used to culture fungi.
Right Answer RightAnswer::A
Explanation [[Explanation::The patient in this vignette has been infected with Neisseria Gonnorhea, a gram negative diplococcus. Neisseria Gonnorhea can be cultured with Thayer-Martin media.

Educational Objective:
References: ]]

Approved Approved::Yes
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