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Chiefs chairman colin powell who later served as secretary of state died from complications from covid-19. his immune system had been compromised from a cancer known as multiple myeloma. it's an incurable form of cancer of the bone marrows affecting the immune system. joining us is a member of the president biden's covid-19 advisory board during the transition. zeke, he had also had prostate cancer years earlier. he was under aggressive treatment at walter reed for the multiple myeloma. talk to me about that disease because there's a lot on social media about -- by the anti-vaxxers, oh, he was...

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...