CDC Director Dr. Rochelle Walensky said the agency is following omicron cases “closely.”
countries and 16 states as of Saturday — numbers “likely to rise” in the United States, the director of the Centers for Disease Control and Prevention said Sunday.... [+]the agency is following the cases closely and knows omicron has more mutations that previous variants, but that it is not yet clear how transmissible omicron is or how effective existing Covid vaccines are against it.
She stressed that the main concern is still the dominant delta variant, which she said accounts for about 99.9% of new Covid-19 cases in the U.S.
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