TimesVideoC.D.C. Concerned by Spread of New Virus VariantsDr. Rochelle Walensky, the director of the C.D.C., said the agency was concerned about the transmission of new coronavirus variants and suggested that relying on U.S. vaccinations alone would not be effective.By Associated Press

TimesVideoC.D.C. Concerned by Spread of New Virus VariantsDr. Rochelle Walensky, the director of the C.D.C., said the agency was concerned about the transmission of new coronavirus variants and suggested that relying on U.S. vaccinations alone would not be effective.By Associated Press

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