unvaccinated people who have already had covid. that's what i want to hear about. because everybody in my family who doesn't want to get a vaccine and who gets very defensive when we ask them why they don't get it, they say, well, i've already had covid so i'm protected. i got the got the plasma, and i'm protected. are they? i don't think so. what do you say? >> well, i've heard that very same thing, so thanks for that question, charlie. you can probably guess i have a lot to say, but first it's really important that we have a qualified medical professional to answer your question. take a listen. >> yes, even those who have been previously infected with coronavirus should get vaccinated. studies have shown that those who have been previously infected and received just one dose of pfizer or moderna had an immune response comparable to those who had been uninfected and received two doses. in addition, we know that natural immunity probably lasts for about six to eight months,