Why scientists are more worried about the Covid-19 variant discovered in South Africa

The variant carries mutations that may weaken the effect of vaccines.

501Y.V2 is still largely restricted to South Africa, but it (or other antigenically drifted variants) may spread more widely in the coming months. I would be planning this potential "strain" update for fall 2021. 9/10

— Trevor Bedford (@trvrb) January 20, 2021