What you need to know about the second booster

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Last week, the Food and Drug Administration and the Centers for Disease Control and Prevention authorized a fourth dose of the COVID-19 vaccine for people 50 years and older, as well as some immunocompromised people.

Yahoo News spoke to Dr. Katelyn Jetelina, an epidemiologist at the University of Texas Health Science Center, to break down what Americans need to know about the second booster.