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.
The decision was made at a time when COVID-19 cases and hospitalizations in the United States have been declining. At the moment, more than 99% of U.S. counties have low or medium COVID-19 community levels, according to CDC data.
So why would someone need another booster at a time…
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