Britain's Prime Minister Boris Johnson speaks to the media as he visits a Covid-19 vaccination centre at Little Venice Sports Centre in London. AFP
Britain's Prime Minister Boris Johnson speaks to the media as he visits a Covid-19 vaccination centre at Little Venice Sports Centre in London. AFP
UK scientists probe Delta subvariant as more than 49,000 new Covid cases reported
Public health body says early evidence shows AY.4.2 could be more transmissible
