A man walks past a sign of a COVID-19 vaccination center in London, Britain, on March 16, 2021. More than 11 million doses of the Oxford/AstraZeneca vaccine have now been given in Britain, and Britain's Medicines and Healthcare products Regulatory Agency (MHRA) has said "very clearly that they're not seeing any increase in the number of cases of blood clots" over what they would see normally, Andrew Pollard, director of the Oxford vaccine group, told the BBC's Today program. [Photo/Xinhua]
