Michael Mina, a former Harvard epidemiologist who is now the chief science officer for eMed, which sold a version of BinaxNow for certified results (such as for travel). In general, these tests all have about the same ability to detect the virus, and you should feel comfortable using any of them to check whether you’ve contracted COVID-19, said Dr. The accuracy of an at-home antigen test depends in part on test sensitivity (in a nutshell, the test’s reported ability to detect a true positive), test specificity (its reported ability to detect a true negative), sample integrity (whether a swab contains enough sample or the swab solution is contaminated by, say, another pathogen), whether someone follows the manufacturer’s instructions exactly, the time since a person’s last known or suspected exposure and/or their onset of symptoms, and the person’s viral load at the time of testing.
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