Omicron Rapidly Tops Delta as Most Common Coronavirus Variant in U.S., Dec 20, 2021:"The highly transmissible omicron variant is responsible for nearly three-quarters of new coronavirus infections in the U.S., according to data from the Centers for Disease Control and Prevention, in a massive jump over just the week prior.
CDC data shows that omicron made up 73% of new coronavirus cases in the week ending Dec. 18, while delta cases dropped to over 26% of infections."
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