Erysipelas Organism — RACP Adult Medicine MCQ

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EasyInfectious DiseasesErysipelas OrganismRACP Adult Medicine

A 50-year-old man: well-demarcated raised erythematous plaque on leg, fever 38.5°C, WCC 18. Most likely causative organism of erysipelas?

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Correct answer: D — Group A Streptococcus (S. pyogenes)

Erysipelas = superficial infection, well-demarcated raised border, predominantly GAS. Treatment: penicillin (mild), benzylpenicillin IV (severe).

Reference: eTG – 2025 – Antibiotic