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korea? plus mourning the mighty mississippi. the concern over his conditions spreads way beyond its banks. >> we can dredge it to a certain point and then mother nature wins. and later, taking wane. >> look at that. >> the children leading the fight to save the monarch butterfly. this is the "cbs weekend news" from new york with jericka duncan. >> good evening, and thanks for joining us on this sunday. tonight, we are learning new information about the attack on paul pelosi, he's the husband of house speaker nancy pelosi. cbs news has confirmed that investigators have determine...

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...