Alarming proportions of methicillin-resistant Staphylococcus aureus (MRSA) in wound samples from companion animals, Germany 2010-2012.
Authors: Vincze Szilvia, Stamm Ivonne, Kopp Peter A, Hermes Julia, Adlhoch Cornelia, Semmler Torsten, Wieler Lothar H, Lübke-Becker Antina, Walther Birgit
Journal: PloS one
Summary
# Editorial Summary: MRSA in Companion Animal Wounds Between 2010 and 2012, researchers analysed 5,229 wound swabs from dogs, cats and horses across German veterinary practices to establish the prevalence and genetic profiles of methicillin-resistant *Staphylococcus aureus* (MRSA) in companion animals. *S. aureus* was recovered from 5.8% of canine wounds, 12.2% of feline wounds and 22.8% of equine wounds; alarmingly, MRSA accounted for 62.7%, 46.4% and 41.3% of these isolates respectively. Genetic typing revealed that dogs and cats carried predominantly human-associated MRSA lineages (CC22 and CC5), whereas equine MRSA was dominated by CC398 (87.7%)—a livestock-associated strain—suggesting a significant shift in the equine MRSA population. The high MRSA carriage rates and species-specific strain distributions indicate that companion animals represent a meaningful reservoir for multidrug-resistant pathogens with zoonotic implications, necessitating surveillance protocols and antimicrobial stewardship to prevent cross-species transmission and limit therapeutic options erosion in equine, feline and canine medicine.
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Practical Takeaways
- •Expect MRSA in roughly 1 in 5 equine wounds and implement strict hygiene protocols; CC398 dominance in horses suggests livestock-related transmission pathways
- •Wound infections in cats and horses carry particularly high MRSA risk (46-23% prevalence); consider MRSA in treatment decisions and culture-based diagnostics for non-responsive wounds
- •Cross-species transmission of MRSA is documented in Germany; biosecurity measures should account for both human-animal and animal-animal contact routes in multi-animal facilities
Key Findings
- •S. aureus was identified in 5.8% of canine, 12.2% of feline, and 22.8% of equine wound swabs from 1,170 German veterinary practices
- •MRSA rates were alarmingly high at 62.7% in dogs, 46.4% in cats, and 41.3% in horses among S. aureus isolates
- •Equine MRSA isolates were predominantly CC398 (87.7%), representing a shift from CC8-MRSA dominance, while canine and feline MRSA were dominated by human-associated lineages CC22 and CC5
- •The high prevalence of MRSA in companion animals, particularly horses and cats, indicates significant zoonotic risk and warrants longitudinal epidemiological monitoring