How close are we to a COVID-19 vaccine?
A look at the vaccines in development and the stages involved
Drugmakers and research centres around the world are working on COVID-19 vaccines, with large global trials of several of the candidates involving tens of thousands of participants well underway.
BioNTech and Pfizer have announced that a vaccine for the coronavirus that they have developed was more than 90% effective in preventing the disease among trial volunteers who had no evidence of having previously been infected.
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