coronavirus vaccine, here’s a guide to the front-runnersSome 200 Covid-19 vaccines are in development around the world, according to the World Health Organization, each one promising to protect people from the deadly coronavirus and allow them to go back to work and school.Also Read | How hunger came back to haunt IndiaNow, several have been authorized for use and are being rolled out in mass immunization programs, while nearly a dozen are in or nearing the final stage of testing.
The U.S. has authorized the Pfizer/BioNTech vaccine, as have the European Union, the U.K. and Canada. The U.S. has also approved the Moderna Inc.