FILE PHOTO: A healthcare worker prepares a dose of the coronavirus disease (COVID-19) vaccine at a vaccination centre inside the Blackburn Cathedral, in Blackburn, Britain, January 19, 2021. REUTERS/Molly Darlington/File Photo
A healthcare worker prepares a dose of the Covid-19 vaccine at Blackburn Cathedral in Lancashire, north-west England. Reuters

Oxford University testing vaccine on children as young as six for the first time