Little is yet known of new strain, but it appears to be most heavily mutated version of the virus yet -- which could affect transmissibility and potentially limit vaccine efficacy

Germany, Italy, and Britain have already restricted most travel from South Africa and neighboring nations, as EU calls on entire bloc to follow suit

As arrival from Malawi becomes first case of highly mutated B.1.1.529 variant detected in country, Health Ministry said to urge mandating additional COVID test for all arrivals

2 other returnees from Malawi also suspected to have contagious B.1.1.529 variant; all 3 were vaccinated; PM calls meeting, urges purchase of PCR kits that better detect the strain

Leaders weigh tighter restrictions as surging cases and coming winter threaten to undo hard-won gains

South Africa, Lesotho, Botswana, Zimbabwe, Mozambique, Namibia, and Eswatini added to list of countries from which foreigners are barred entry

World Health Organization estimates that the pandemic's overall toll could be two to three times the official tally

Menorah lighting event to be held on December 1; invitations went out just a week in advance

Top immunologist Cyrille Cohen reflects on the dosage, efficacy and timing of the shots being rolled out for kids

Phase II trial of MesenCure among 30 patients with serious coronavirus cases shows almost all lived and had shorter hospital stays than controls, but expert says more data needed