How do each of the leading COVID-19 vaccines differ?

The world finally received uplifting COVID-19 news this week when Pfizer announced its vaccine appears to be more than 90 percent effective — but there are plenty of other potential immunizations in the works, too.

In fact, the US and other countries are hoping to have a variety to choose from once the vaccines win their race toward government approval.

Here is how some of the leading vaccines work and how they differ:


How it works: Specially manufactured mRNA, or…

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