If you've already had COVID-19 (you have had the antibody test and know through provable science that you had it) and you're no longer contagious, but you then go spend time in a hot zone aroud others who have the virus, could you still carry it back to loved ones? I have family who have had the virus and got over it months and months ago. Now, they're going to Mexico to vacation under the belief that they're very unlikely to catch it again. And the CDC agrees that's true, so that's fine with me. However, if they're exposed to COVID-19 can they still carry it back and infect someone else even though my relative have some immunity and won't get sick again?