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SAN FRANCISCO — The drug industry’s annual confab here this week drew thousands of investors and executives from around the world — plus at least 488 microbial species along for the ride on their cellphones.

That’s a key finding of a small, rapid-turnaround research study conducted at the J.P. Morgan Healthcare Conference over the past few days. Weill Cornell Medicine researchers analyzed the DNA of microbes on 96 cellphones handed over by conference attendees for sampling during registration on Sunday.

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