Occupational hazard: COVID-19 false positives found in lab workers

For some laboratory workers a positive test for SARS-CoV-2 may more accurately indicate an occupational exposure rather than a viral infection. This week in Microbiology Spectrum, researchers in Seattle report on a small group of laboratory workers whose false positive tests for the virus came not through viral RNA, but instead from a usually harmless bit of DNA, called a plasmid, that’s commonly used to study the virus.

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