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...