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So if you are high in terms of your ability to tackle this virus antibodies you cut down lower but you still have a question. if you've vaccinate some time ago and he weren't boosted and we did not test directly ourselves i think natural infections does something similar. then you may not be as well protected or maybe not protected from infection. we protected or maybe not protected from infection.— protected or maybe not protected from infection. we talk a lot on the news about — from infection. we talk a lot on the news about antibodies _ from infection. we talk a lot on the news about a...

Shows that people who have recovered from covid have strong immunity and i mean b-cell data just this week actually and t-cell data, those are called memory cells. antibodies will actually be higher if you've had a severe infection. lower if you've had a mild infection. but they come down after vaccination anyway. it's about what is cellular memory. >> isn't it, dr., gandhi, a very individualized process? in other words, millions have gotten the vaccine and there's a ton of data as to what we can expect in those cases. but for those that have had it, how do we really know, inlay terms, that th...

Antibodies lasted longer after the pfizer booster. and it helped memory cells, immune memory cells. again, small study done by johnson & johnson. do these differences mean anything? are they significant? who knows. this has not been published in a medical journal or reviewed by anyone. people should not get fussy about what booster they get. boosters help. and it really -- it doesn't seem to matter in any significant way what booster you get. >> get boosted. elizabeth cohen, thank you very much. some vaccine skeptics going to extremes to get a vaccine certificate without getting a shot. a ma...

Of people recently who are 65 years of age or others over the age of 50 with a high-risk medical condition in which case you could reasonably argue for those groups because you want to make sure you have a high level of protection against serious illness. on the other hand, and the reason that's true is because all you need for protection against serious illness is immunological memory cells, so-called memory b-cells and they are apparently induced at fairly high frequency and for years so we're good. on the other hand, if you're trying to argue i also want protection against even a.ik infecti...

Be harder to convince people to get because they are, by definition, one and done people? >> so the good news is that even a single dose induces immunological memory cells that are responsible for protecting against serious illness. we always talk about neutralizing antibodies. neutralizing antibodies fade over time but memory cells don't. for a long period of time -- the interesting thing about the j&j versus pfizer and moderna is really just a single dose of the j&j was able to induce excellent immunological. so that was the advantage of the j&j vaccine. hopefully people will get the second ...