Americans should get the COVID-19 vaccine even if they were infected with the new disease, a top health official said on Sunday. “What we know is, it is safe to be immunized after having been exposed to the virus. That has happened in the clinical trials. People that participated in the trials experienced or actually have a viral infection at the time that the trial started,” Operation Warp Speed’s chief scientific adviser Moncef Slaoui said on CNN’s “State of the Union.” “So it’s safe. On the other hand, we know that infection doesn’t induce a very strong immune response, and it wanes over time. So as a clear precaution, it is appreciate to be vaccinated, because it’s safe, it will induce a much higher immune response, and will ensure, in case natural infection doesn’t induce long-lasting protection, it will allow to have better protection. I think people should be vaccinated, indeed.” …