Enterotoxin Production by Staphylococcus aureus Isolated from Mastitic Cows
Abstract:Staphylococcus aureus is an important cause of mastitis in cows. The ability of S. aureus strains to produce one or more enterotoxins in milk and dairy products is linked to staphylococcal food poisoning. Todetermine whether staphylococci causing bovine mastitis could cause human foodborne intoxication, the production of staphylococcal enterotoxins A through D (SEA, SEB, SEC, and SED) by 160 S. aureus isolates was evaluated with the use of a reverse passive latex agglutination enterotoxin kit. All S. aureus strains were isolated over a 9-month period from 2,343 routine submissions of a composite quarter collection of individual mastitic cows at 18 dairy farms in the San Joaquin Valley in California. Prior to enterotoxin detection, isolates were grown by a method that enhances the in vitro synthesis of enterotoxin. Twenty-two of 160 S. aureus isolates produced enterotoxin. Seven produced SEC, 12 produced SED, and 3 produced both SEC and SED. None of the isolates produced SEA or SEB.
Document Type: Miscellaneous
Affiliations: 1: Department of Population, Health and Reproduction, Veterinary Medicine Teaching and Research Facility, School of Veterinary Medicine, University of California, Davis, California 93274, USA 2: Dipartimento di Scienze degli Alimenti, Università degli Studi di perugia, 06126 Perugia, Italy
Publication date: September 1, 2003
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