LONDON ??" Scientists at Oxford University have released more data that confirm coronavirus vaccines made by Pfizer-BioNTech and AstraZeneca both significantly cut the risk of infection after a single dose. In studies published on Friday, researchers said there was no apparent difference in the vaccines' ability to reduce COVID-19 infection rates. The research has not yet been published in a peer-reviewed journal but is based on data from nose and throat swabs taken from more than 370,000 in a...