NEW YORK (GenomeWeb News) – Through a phylogenetic analysis, researchers in the UK have traced the origin of human cases of community-acquired methicillin-resistant Staphyloccosus aureus to strains circulating in cows.

As the University of Edinburgh's Ross Fitzgerald and his colleagues reported in mBio today, though, those S. aureus strains didn't develop resistance to methicillin until after they crossed into people.

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