The density of mutations raises concerns. While it’s too early to say, new variants can limit a vaccine’s effectiveness. Hours later Britain banned flights from six countries in the region. https://ift.tt/3FRwzIX https://ift.tt/3rfyZNv World New York Times November 24, 2021 at 07:00PMSouth Africa detects a new variant displaying a ‘big jump in evolution.’

By Lynsey Chutel and Andrés R. Martínez from NYT World https://ift.tt/3FRwzIX
https://ift.tt/3FRwzIX https://ift.tt/3rfyZNv New York Times