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Early life as it is believed to have looked 335 million years ago, well before the age of the dinosaurs. Ancestors of hospital pathogens are now believed to have lived in the guts of these ancient land animals. | Mark Witton
Medicine

The Trail of Antibiotic-Resistant Superbugs Leads Back to the First Land Animals

Researchers say powerful bacteria that are resistant to common antibiotics acquired their hard-to-kill traits 450 million years ago.

May 11, 2017
12:32 PM EDT

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