we talked to a volunteer behind a program tonight, the new and dire warning. the covid risk to all americans is, quote, at an historic high. that warning from the white house coronavirus task force today. the head of the cdc now predicting the u.s. could see 200,000 more deaths by february. what top health officials are now telling americans over 65 about leaving the house. tonight, the uk, the first country to approve the pfizer vaccine. the rollout now under way. and here in the u.s., when authorities say to expect emergency approval here. with that news overseas, the pfizer vaccine approved and likely soon here, we ask, how sure can americans be that it is safe? should they expect any side effects? dr. jha is right here tonight answering your questions. despite that new warning from president trump's own task force on the virus, the images from inside the white house, the