The general population will likely not be vaccinated before mid-2022, a new report says.
The European Union is lifting travel restrictions for some countries.
Brexiteers partied in Parliament Square as the UK's 47-year membership to the EU came to an end.
The Conservatives promise to pull out of the EU by Jan. 31, 2020.
The Labour leader says he will support the move with Brexit delayed.
British MPs voted to amend the agreement to request an extension.
Boris Johnson is calling on British MPs to back the new agreement.
The EU has been offered "reasonable" terms, the British PM says.
Boris Johnson's decision to prorogue has left politicians crying foul.
Great Britain is set to leave the EU without a deal in place on Oct. 31.