NPR News: A COVID-19 Vaccine May Be Only 50% Effective. Is That Good Enough?

A COVID-19 Vaccine May Be Only 50% Effective. Is That Good Enough?
As scientists race to develop a vaccine that proves "safe and effective," that doesn't mean it will prevent infection in everyone who gets it. Though it might eventually stop the pandemic. Here's how.

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Làm đẹp Blog 247 September 12, 2020 at 06:00PM
Category Health & Science