MRSA in livestock animals-an epidemic waiting to happen?

Screening of pig farmers and pigs in The Netherlands has revealed that >20% of pig farmers and 39% of slaughterhouse pigs are positive for an unusual strain of methicillin-resistant Staphylococcus aureus (MRSA) belonging to sequence type (ST) 398. It is now clear that the emergence of ST398 is not just a Dutch problem, with human infections being described in several European countries, Canada and Singapore. Furthermore, some human isolates have now acquired the genes encoding Panton-Valentine leukocidin. Livestock may become an important source of community-acquired MRSA. A concerted effort on the part of clinicians, infection control practitioners and veterinarians will be required to prevent further spread of this novel strain of MRSA.