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Applied and Environmental Microbiology, December 2001, p. 5551-5557, Vol. 67, No. 12
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.12.5551-5557.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Enterotoxigenic Potential of Staphylococcus intermedius

Karsten Becker,1,* Birgit Keller,2 Christof von Eiff,1 Michaela Brück,1 Gabriele Lubritz,1 Jerome Etienne,3 and Georg Peters1

Institute of Medical Microbiology, University of Münster, 48149 Münster,1 and Department of Microbiology and Infectious Diseases, School of Veterinary Medicine, 30173 Hannover,2 Germany, and Centre National de Référence des Toxémies à Staphylocoques EA 1655, Faculté de Médicine R. T. H. Laennec, 69372 Lyon cedex, France3

Received 18 June 2001/Accepted 26 September 2001

Staphylococcal food poisoning (SFP) caused by enterotoxigenic staphylococci is one of the main food-borne diseases. In contrast to Staphylococcus aureus, a systematic screening for the enterotoxins has not yet been performed on the genomic level for the coagulase-positive species S. intermedius. Therefore, the enterotoxigenic potential of 281 different veterinary (canine, n = 247; equine, n = 23; feline, n = 9; other, n = 2) and 11 human isolates of S. intermedius was tested by using a multiplex PCR DNA-enzyme immunoassay system targeting the staphylococcal enterotoxin genes sea, seb, sec, sed, and see. Molecular results were compared by in vitro testing of enterotoxin production by two immunoassays. A total of 33 (11.3%) S. intermedius isolates, including 31 (12.6%) canine isolates, 1 equine isolate, and 1 human isolate, tested positive for the sec gene. In vitro production of the respective enterotoxins was detected in 30 (90.9%) of these isolates by using immunological tests. In contrast, none of 65 veterinary specimen-derived isolates additionally tested and comprising 13 (sub)species of coagulase-negative staphylococci were found to be enterotoxigenic. This study shows on both molecular and immunological levels that a substantial number of S. intermedius isolates harbor the potential for enterotoxin production. Since evidence for noninvasive zoonotic transmission of S. intermedius from animal hosts to humans has been documented, an enterotoxigenic role of this microorganism in SFP via contamination of food products may be assumed.

* Corresponding author. Mailing address: University of Münster, Institute of Medical Microbiology, D-48149 Münster, Germany. Phone: (49) 251 83-55360. Fax: (49) 251 83-55350. E-mail: kbecker{at}uni-muenster.de.

Applied and Environmental Microbiology, December 2001, p. 5551-5557, Vol. 67, No. 12
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.12.5551-5557.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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