Ariana Remmel A vaccinator prepares a dose of the Oxford-AstraZeneca COVID-19 vaccine.Credit: Monirul Bhuiyan/AFP/Getty In mid-March, several European countries paused distribution of the COVID-19 vaccine made by the University of Oxford, UK, and the pharmaceutical firm AstraZeneca, following reports that some people had developed blood-clotting disorders after receiving the jab. The decisions were based on...
