Antibiotic-resistant microbes traced back 450m years

Surviving mass extinctions helps explain nearly indestructible properties of hospital superbugs.

Leading antibiotic-resistant enterococci in hospitals arose from an ancestor that dates back 450 million years — about the time when animals were first crawling onto land (and well before the age of dinosaurs), according to a new study led by researchers from Massachusetts Eye & Ear, the Harvard University-wide Program on Antibiotic Resistance and the Broad Institute of MIT & Harvard.

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