A volunteer participating in clinical trials of the Covid-19 vaccine developed by Oxford University has died in Brazil, officials announced Wednesday, though media reports said he had received a placebo, not the test vaccine. It is the first death reported…

A coronavirus vaccine developed by the University of Oxford appears safe and triggers an immune response. But how optimistic should we be, and what are the next steps? Subscribe to our channel here: Trials involving 1,077 people showed the injection…