Tests can detect the Covid-19 virus4 March 2021What was claimed The Covid-19 virus cannot be detected with tests. The false positive rate of Covid-19 PCR tests in the UK is extremely low. 1 of 2 claimsA post on Facebook falsely claims that Covid-19 tests have a 100% false positive rate, because the virus causing the disease cannot be detected with tests. We’ve written before about how PCR tests work, and why they are an accurate way to detect the Covid virus. For the purposes of that scheme, we’ve rated this claim as false because the Covid-19 virus can be detected with tests, and PCR tests for it have an extremely low false positive rate.