KGO ABC World News Tonight With David Muir August 20, 2021 00:44:00
Growing evidence of the need for this third shot, a booster shot, that they say will now be available starting september 20th, of course, pending fda approval. tonight, a new preliminary study in the uk finding that vaccinated people who get breakthrough cases with the delta variant have a higher viral load. we've heard this from u.s. authorities before. this study says they are more likely to transmit the virus to others. and just today, the news coming in that three senators announcing separately that they have now tested positive. all of them were fully vaccinated, so, these are breakthroug...