Abstract
Coagulase-positive staphylococci (CoPS) are potential causative agents of equine infections, but they are rarely responsible for the death of the animal. In the current study, staphylococci implicated in the death or euthanasia of horses were retrospectively studied in 3,457 necropsies performed over a decade (1995-2006). Morbidity associated with CoPS was 1.7%, representing 60 isolates of CoPS, which were identified as Staphylococcus aureus (59) and Staphylococcus pseudintermedius (1). Coagulase-positive staphylococci (alone or in association with another bacterial species) were associated with the death or euthanasia of 90% of the cases (54/60). Proportions of antibiotic resistance to penicillin G and tetracycline reached 62.7% and 23.7%, respectively. Virulence genes were detected in 91.7% of the strains, with a majority of seh or sei enterotoxin genes. Finally, 3 methicillin-resistant Staphylococcus aureus (MRSA) isolates belonging to the t064 spa-type were identified. One strain was isolated in 2003 and might thus be one of the first cases of equine MRSA in France.
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