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Where they live. >> masking is, i think, a lot of us would say is something pretty small that we can do in order to prevent all these negative consequences. >> nearly 99% of the u.s. population lives in counties where people should be wearing masks indoors, according to new cdc guidance. the fda expected very soon to green light an additional vaccine shot for the immunocompromised. >> that actually encompasses a relatively small proportion of the population. around 3% or so. >> reporter: so what...