Group A carbohydrate of Str. pyogenes cross reacts with human_________________?
Correct answer: C. Cardiac valves
- A. Synovial fluid
- B. Myocardium
- C. Cardiac valves
- D. Vascular intima
Explanation
The group A streptococcal carbohydrate contains N-acetylglucosamine, which can cross-react with components of cardiac valves in rheumatic heart disease. Myocardial cross-reactivity is more classically associated with antibodies against streptococcal M protein.
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