Quick guide: COVID-19 vaccines in use and how they work

Dozens of coronavirus vaccines entered clinical trials during 2020, and now, a handful have been authorized for emergency use in various countries — meaning the shots can be administered to the public while their developers continue to collect data on their safety and efficacy. Should they meet all the necessary criteria, these vaccines could be fully approved in the future, and in some places, they already have been.

Here’s a quick guide to the COVID-19 vaccines now in use around the world.

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