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>> so some of the other ones that i mentioned, as well as other viruses like hiv, it's already documented that they had animal origins. but sars took about ten years to figure out where it came from. so i don't think we're going to have the answers any time soon. but we really need to know as many details as possible. >> okay. lots of talk about booster shots. what's next? there's a trial that is set to launch that will tell us if people can mix and match their shots. when do you think the american people will get a timeline on booster shots and the certainly of which one they can use? >> i th...

Lifetime. the study suggests most people who have had and recovered and then got immunized will not need boosters but vaccinated people who were never infected probably will need the shots. put that into lamen's terms for us. how good is this news? >> right. good question. so it's very, very encouraging. it shows how complex and really amazing our immune system is. that there are just antibodies and memory cells in our marrow that hang out after we get infected that still respond and can create a robust response after -- if you're exposed again. and so it also shows that folks who are infected...

But what we should excited about and encouraged is you have these memory cells that are ready to jump into action once we have the virus or are exposed again. people who have been infected and produce this beautiful momry overtime, it would be a great plan to get vaccinated. >> snofr rand paul who says he's not getting vaccinated because he had the virus. this would have such an impact on people. it could protect them forever. what about people who haven't been protected but just vaccinated. what does the research say about it? >> there are studies ongoing. they're showing very encouraging sig...

Coronavirus may last for years, even lifetime. that's according to two new stories. joining me now, you have an interesting study. earlier, months ago, there was some evidence that the amount of antibodies in your body waned. you looked aet something different. you said we're seeing something different that's actually very encouraging and that has to do with memory cells. what are you talking about, and why is it important? >> it's very important because we're looking at the source of these antibodies that are produced by cells that live in our bone marrow, so what we saw in people who have be...

Being generated and maintained almost a year after they have resolved their symptoms. so that means these immunities are durable. >> you have the memory cells so if you are infected the cells will activate the antibodies, it will fight the virus. does that mean if you've been infected? does that mean if you've had the virus, you don't need the vaccine? >> absolutely not. what we're saying and what we're seeing is when you have the antibodies, you have a really good memory, and that memory could be great if you have a lot of these antibodyies and if the virus didn't change. obviously what we ha...