“You may have tested too early, and the virus still hasn’t replicated enough yet,” Tran said. If you test negative, many of the same recommendations still hold - you may need to do repeat testing to ensure that the result is accurate. “But I would say the best rule of thumb is to start testing three days after exposure, and if you’re negative, test again on day four or five,” he said. If you get a positive result on a rapid test, it’s most likely you are contagious and can spread the virus. Does a positive rapid test mean I’m contagious? The changes that lead to new variants tend to occur in the spike protein. and globally detects a protein called the nucleocapsid, which is stable and just doesn’t, hasn’t seen a lot of mutations,” he said. “Almost every rapid test that’s authorized in the U.S. That’s because the mutations are happening in a different part of the virus than the portion detected by rapid tests. “We’ve actually never seen a deterioration in accuracy of the tests, given any new variants,” he said. Michael Mina, a Covid testing expert and former professor of epidemiology and of immunology and infectious diseases at the Harvard T.H. The at-home Covid tests on the market should pick up all of the variants in circulation, including EG.5, FL.1.5.1 and BA.2.86, said Dr. Do rapid tests work on the variants in circulation? Here’s a refresher on how and when to test for Covid, and what your at-home results really mean.
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