While the vast majority of recent COVID-19 infections in the U.S. are caused by the delta variant, a new coronavirus variant, omicron, is beginning to spread. Preliminary tests show that current vaccines are much less effective at fighting omicron, a strain with multiple mutations. Although scientists expect to see more breakthrough infections as omicron spreads, they say being vaccinated will continue to protect people from severe illness and hospitalization. Listen to learn about how to stay safe from a highly contagious new viral strain.
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