Micro & Immunology · single question
Erysipelas is caused by which organism?
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Correct answer: A. Beta-hemolytic Streptococcus (Group A Strep / S. pyogenes)
Erysipelas is a superficial skin infection (dermis, upper subcutaneous tissue) caused by Group A beta-hemolytic Streptococcus (Streptococcus pyogenes). It causes well-defined, raised, bright red plaques with sharp borders, typically on the face. S. pneumoniae causes pneumonia/meningitis. Staph causes deeper cellulitis. Group A Strep = classic erysipelas.
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