Britain says new Covid-19 variant is the most significant yet found

Britain said on Friday that a newly identified coronavirus variant spreading in South Africa was considered by scientists to be the most significant one yet found and so it needed to ascertain whether or not it made vaccines ineffective.

Defending a ban on flights from South Africa, Namibia, Botswana, Zimbabwe, Lesotho and Eswatini, Transport Secretary Grant Shapps said that the lesson of Covid-19...