Beta-Lactam Antibiotics · Pharmacology

The 'Jarisch-Herxheimer reaction' is a systemic inflammatory response sometimes seen after the first dose of penicillin in patients with:

  1. Strep throat
  2. Syphilis
  3. Lyme disease
  4. Urinary tract infection
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Correct answer: Syphilis

This reaction is caused by the sudden release of lipoproteins and endotoxins from dying spirochetes (like Treponema pallidum). It presents as fever, chills, and headache shortly after starting treatment.

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