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New MRSA strain in cows and people

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RESEARCHERS at Cambridge veterinary school have found a new strain of meticillin-resistant Staphylococcus aureus (MRSA), which occurs in both people and dairy cows and which cannot be detected with current ‘gold standard’ molecular tests.

Writing in The Lancet Infectious Diseases, the researchers, led by Mark Holmes, describe how they found the new strain while researching mastitis in dairy cattle. The strain was phenotypically resistant to meticillin, but tested negative for the mecA gene (which confers resistance to antibiotics such as meticillin) in molecular tests.

The genome of the new strain was sequenced by Matt Holden and …

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