COVID-19 boosters are here

The United States is on the verge of dramatically expanding the availability of COVID-19 vaccine boosters to shore up people's immune systems. As NPR health correspondent Rob Stein reports, the Food and Drug Administration is poised to authorize the boosters of the Moderna and Johnson & Johnson vaccines. Still, many experts argue boosters aren't needed because the vaccines are working well and it would be unethical to give people in the U.S. extra shots when most of the world is still waiting for their first.

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