Methicillin resistant Staphylococcus aureus (MRSA) in pigs

There are several varieties of Methicillin resistant Staphylococcus aureus (MRSA) some of which are associated with animals (especially pigs), and are collectively referred to as LA-MRSA (Livestock Associated - MRSA). 

Within a few years, LA-MRSAs have become widespread in swine populations around the world, thereby representing a risk for dissemination to the human population.

Methicillin resistant Staphylococcus aureus (MRSA) has been surveyed yearly in pigs in Norway since 2014. The objective of the surveillance is to identify LA-MRSA positive swine herds with the intention of contact tracing and eradication, with an overall goal of keeping the Norwegian pig population free of LA-MRSA.


The surveillance programme in 2017 did not detect any pig herds with LA-MRSA CC398. However, MRSA CC7, and CC130 and CC425 were detected in one multiplier herd and in two farrow to finish herds, respectively. MRSA was not detected in any of the genetic nucleus herds, nor in the central units of the sow pool herds. In total, 826 herds were included in the survey, of which 85 were genetic nucleus or multiplier herds, 12 herds were the central units of sow pool herds, and 729 were herds with more than 10 sows.

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