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Created page with "== Introduction == Streptococcus pyogenes is a species of Gram-positive bacteria that is responsible for a wide range of human diseases. It is a member of the genus Streptococcus, which includes several other pathogenic species. S. pyogenes is classified as a Group A Streptococcus (GAS) due to its Lancefield grouping, which is based on the carbohydrate composition of antigens found on the bacterial cell wall. This bacterium is known for causing both mild infecti..."