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Meningococcemia — USMLE Step 3 MCQ

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ModerateEmergency MedicineMeningococcemiaUSMLE Step 3

A 19-year-old college student presents with fever, headache, confusion, neck stiffness, and a rapidly progressive petechial rash. Blood pressure is 84/48 mm Hg. Platelets are low and lactate is elevated. Which of the following is the most likely diagnosis?

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Correct answer: E — Meningococcemia

Septic shock with meningitis signs and petechial rash in a young adult suggests invasive meningococcal disease.

Reference: CDC meningococcal disease clinical guidance: https://www.cdc.gov/meningococcal/