Researchers at McMaster University in Ontario examined the DNA of 30,000-year-old bacteria from now-extinct animals such as the mammoth discovered in the Yukon permafrost and found that ancient bacteria harbored major genes responsible for resistance to antibiotics. "Antibiotic resistance is part of the natural ecology of the planet, and this finding is a cautionary note about how we use these things," said Gerard D. Wright, one of the researchers.

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