Halth Experts News Today

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 not peer reviewed, more study is needed.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 heres 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...