KGO ABC World News Tonight With David Muir April 23, 2021 00:37:00
And authorities say that reflects in part some of the hesitancy in folks who have yet to get the shot. 134,286,000 people have received at least one dose. that's 52% of all adults now. and tonight, the cdc acknowledging that it is now looking again at its mask guidelines. so, could there be changes there? and news on cases of the virus even after getting the vaccine. what are called breakthrough infections. and there's some encouraging news on that front tonight. so, here's our senior national correspondent steve osunsami from the cdc in atlanta. >> reporter: any future use of the johnson & jo...
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