NPR News: Why You Should Still Wear A Mask And Avoid Crowds After Getting The COVID-19 Vaccine

Why You Should Still Wear A Mask And Avoid Crowds After Getting The COVID-19 Vaccine
It takes time after vaccination for immunity to the virus to build up, and no vaccine is 100% effective. Plus, scientists don't yet know if the vaccine stops viral spread. Here's what's known so far.

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