KGO ABC World News Tonight With David Muir December 2, 2021 23:40:00
>> reporter: but dr. hoge today sounding more optimistic about his company's mrna vaccine than moderna's ceo stephane bancel did just days ago, saying there was, quote, no world in which vaccine effectiveness doesn't drop against this new variant. >> i probably would have used different words. there is a scenario that the current vaccines wouldn't be by themselves sufficient to get the same high level of efficacy, but that doesn't mean that they wouldn't work at all. >> all right, so, let's get to martha raddatz with us tonight. we heard the moderna president call omicron probably one of our w...