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@DrZoeHyde@mstdn.science A new study shows that multiple rapid antigen tests are needed to reliably detect COVID-19. During the first week of infection, a single test has 82.5% sensitivity in symptomatic cases and only 34.4% in asymptomatic cases, compared to a PCR test. [thread emoji; link] @DrZoeHyde@mstdn.science Taking 2 tests 48 hours apart increases the sensitivity of rapid antigen testing to 93.4% (symptomatic cases) and 55.3% (asymptomatic cases). Taking 3 tests 48 hours apart (i.e., 96 hours between tests 1 & 3) increases sensitivity to 94.3% (symptomatic) and 68.5% (asymptomatic). @DrZoeHyde@mstdn.science This study was conducted during the delta variant and early omicron variant period. The authors note that results may change with newer variants. Because false negative results are common, the authors warn that “people testing for SARS-CoV-2 should exercise caution despite an initial negative result ... and favor mask wearing and avoiding crowded places if they suspect they may be infected or have been exposed.”