Definition: a bacterial species found in the human mouth, throat, and respiratory tract and in inflammatory exudates, the bloodstream, and cellulitic lesions in human diseases; it is sometimes found in the udders of cows and in dust from sickrooms, hospital wards, schools, theaters, and other public places; it causes the formation of pus, fatal septicemia, and necrotizing fascitis and myositis. There is also a specific somatic antigen (M protein) for each of the approximately 85 types. It is the type species of the genus Streptococcus.
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Examples: glitazone, GI cocktail, etc.