National Health & Safety Scientists Are Working On Booster Shots In Case COVID-19 Vaccines Lose Their Effect 4:26pm April 22, 2021 by Joe Palca Health Medical Treatments National Share URL copied to clipboard! Copyright 2021 NPR. To see more, visit https://www.npr.org. 300x250 Ad More All Things Considered National Religion Education Unpacking the truth of antisemitism on college campuses National Businesses in Florida struggle after one year of strict immigration law by Jasmine Garsd 300x250 Ad Support quality journalism, like the story above, with your gift right now. Donate