Enterotoxin production by atypical Staphylococcus aureus from poultry*

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Abstract
Phenotypically typical S. aureus was isolated frequently from the necrotic bone and liver of poultry [chickens] suffering from femoral head necrosis. Occasionally, strains were isolated that differed from typical S. aureus in .gtoreq. 1 of the major diagnostic tests, i.e., coagulase production, anaerobic fermentation of mannitol and production of a heat-stable DNase. Such atypical strains were also isolated from nasal swabs of healthy birds. Tests for enterotoxin production demonstrated that some atypical strains from sick and healthy birds are capable of producing staphylococcal enterotoxins.