MRSA in livestock acquired drug resistance on the farm, now infects humans

Researchers have discovered that a strain of methicillin-resistant Staphylococcus aureus (MRSA) bacteria that humans contract from livestock was originally a human strain, but it developed resistance to antibiotics once it was picked up by farm animals. The findings, which appear in the online journal mBio on Tuesday, February 21, illustrate a very close link between antibiotic use on the farm and potentially lethal human infections.

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