U.S. allows 2nd booster for adults over 50, immunocompromised

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People over 50 years old and those with weak immune systems may now get a second booster shot for COVID-19.

Both the U.S. Centers for Disease Control and Food and Drug Administration approved the expansion of the emergency use authorization for a fourth dose. A second booster can be given four months after the first one for Pfizer and Moderna vaccines.

Let's find out why global experts are recommending a fourth shot from former U.S. FDA associate commissioner Peter Pitts.