The news follows a stunning defeat for Johnson's Conservative Party in a by-election
Vaccine requirement applies to companies with 100 or more employees
Omicron was first named a variant of concern by the World Health Organization on November 26
New variant fuels infections in Europe, US
United Nations warns the stigmatization and marginalization of migrants puts many lives at risk
Three people were found to have the variant among 26 travelers who tested positive for coronavirus
WHO leader speaks at First International Conference on Public Health in Africa
The drugmaker also said authorization for a vaccine for young children might be delayed
Rockettes Christmas show was canceled for season amid virus outbreaks
Option involves testing twice during seven-day period after exposure
Karl Lauterbach says what's being observed in Britain exceeds everything so far in the pandemic
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