"Public health authorities want people to keep wearing masks and social distancing, even after they receive a vaccine. This might seem counterintuitive – after all, if someone gets a vaccine, aren’t they protected from the coronavirus?The answer is complicated: the vast majority of people who are vaccinated will be protected from Covid-19, the disease caused by the SARS-CoV-2 virus. However, vaccinated people may still be able to transmit the virus, even though they do not display any symptoms.“We know now the vaccines can protect, but what we haven’t had enough time to really understand is – does it protect from spreading?” said Avery August, professor of immunology at Cornell University.That is because the the SARS-CoV-2 virus may still colonize the respiratory tract, even as systemic immune cells protect the overall body from the disease it causes – Covid-19."
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