The first case of COVID-19 from the omicron variant in the U.S. was in a person who had been vaccinated, but hadn’t received a booster. Dr. Fauci said it was a mild infection, and none of the traveler’s close contacts have tested positive. While many have said this was just a matter of time, it begs many questions. William Brangham has more with Michael Osterholm of the University of Minnesota.

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