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Streptococus pyogenes comprises which Lancefield group?

  • A.A
  • B.B
  • C.C
  • D.D

Answer: A

Correct answer: A

S. pyogenes carries the group A cell wall carbohydrate, which is what the Lancefield grouping detects and what gives it its everyday name of group A streptococcus. Group B is S. agalactiae, the neonatal pathogen, and group D covers the enterococci and S. bovis.

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