The UK just approved Pfizer's COVID-19 vaccine. Here are our 5 biggest questions about the shot.

The UK just approved Pfizer's COVID-19 vaccine. Here are our 5 biggest questions about the shot.

Business Insider

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The UK regulator approved Pfizer and BioNTech's COVID-19 shot in record time, but don't put away your mask right away. Here's why.

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