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Evidence and experts to help you understand today’s public health news—and what it means for tomorrow.

Dec 18, 2020

Why do COVID-19 vaccines require two doses? Will I still have to wear a mask and social distance once I get the vaccine? If my friends and I had COVID, can we get together for the holidays? Are people who wear a face covering with their nose exposed at higher risk of getting COVID?

Dr. Josh Sharfstein and Dr. Caitlin Rivers answered frequently asked questions about COVID-19 and vaccines sent to

KEYWORDS: vaccine trial; vaccine authorization; immune response