group A streptococci

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Strep. pyogenes is the only member of Lancefield group A streps. It is the most pathogenic species and is present as a commensal in the throat of less than 10% of people, mostly children. It produces a large number of powerful enzymes and toxins.

Mode of transmission is variable - airborne droplets in urinary tract infections; skin squames or direct contact with lesion as in impetigo.

Last reviewed 03/2022