Under 15 million Americans have received the latest booster shots.
However, falling temperatures have sparked concerns about increased transmission, as well as the looming threat of a more infectious variant.
Omicron sublineages have been growing in prevalence in the U.S., with the Centers for Disease Control and Prevention showing BA.4.6 and BQ.1.1 growing over the past few weeks.FILE-A memorial to victims of Covid-19 is seen at the Lincoln Memorial pool on January 19, 2021 in Washington, DC. to help stave off another surge, but just under 15 million people have received the updated shots.
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