Here’s what you need to know about how the vaccines work, how they’re being tested and how they might be rolled out to the public — if, and it’s still a big if, they are proven to work. The most common in use today contain inactivated viruses, weakened live viruses, or pieces of proteins. Moderna and Pfizer are testing a new kind of vaccine that has never before been approved for use by people. What do we know about how well these vaccines work? Both vaccines have gone through extensive early tests, but we still don’t know for sure if they’re safe and effective.

Source: New York Times September 02, 2020 22:46 UTC