ABC World News Tonight With David Muir
Unvaccinated americans. and new questions after a new study that suggests the johnson & johnson one-shot vaccine may not be as effective as the other vaccines against this variant. not peer reviewed, more study is needed. but here's trevor ault. >> reporter: tonight, the delta variant spreading furiously among the unvaccinated, now estimated to account for 4 out of every 5 cases of coronavirus. >> the delta variant now represents 83% of sequenced cases. this is a dramatic increase up from 50% for the week of july 3rd. >> reporter: and tonight, adding to the concern, the new headline involving ...
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