anti-vaccine forces seized on this as some sort of i told you so moment. even those who don't find themselves in that camp might still have some legitimate questions tonight. that is yeah we want to speak with someone who can give this perspective and factual underpinning it deserves, cnn medical analyst and former baltimore health commissioner, dr. leana wen. author of "lifelines, a doctor's fight for public health." >> of course, anderson, we have to keep in mind that risk is additive. and general powell had at least two major risk factors for severe outcomes to covid-19. the first is age. an analysis of cdc data from august found that even if you are fully vaccinated, in their 80s have -- and then, you have multiple myeloma which is a blood cancer that, by itself, substantially increases the risk of infection. and treatments to multiple myeloma, too, include