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A used rapid antigen test, also known as a lateral flow test showing a positive test result for the Covid-19 coronavirus is photographed in Berlin on January 22, 2022. - Taking a test involves doing swab from inside your nostril or in your throat, depending on the test you are using, before mixing the swab with solution and dripping it onto a container with a test strip with antibodies specific to the Covid-19 virus painted on it in a thin line. If the testing strip detects the virus, it shows up as a red line next to the “T” on the container, the line next to the “C”should always be visible. (Photo by Odd ANDERSEN / AFP) (KEYSTONE/AFP/ODD ANDERSEN)