NOTE TO READERS (Aug. 3, 2015): Researchers at Weill Cornell Medical College have revised their study of the microbiome of the New York City subway system to indicate that there is not enough evidence to say that they found infectious traces of anthrax and bubonic plague in the system. The revision was published in the journal Cell Systems. Geneticist Christopher Mason calls the mistake “an error of interpretation” that does not apply to the broader findings.

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