RELATED: UK variant a 'brand new ballgame,' infecting children in US 'very readily,' epidemiologist warnsAdvertisement As of April 7, more than 16,200 total cases of B.1.1.7 have been reported since it was first detected in the U.S.
in December, data from the CDC shows.According to data collected by Johns Hopkins University, the United States has more than 30.8 million confirmed COVID cases across all lineages — the most in the world.
As of April 7, the U.S. also leads the world in deaths at more than 556,000.On Wednesday, Walensky also noted that while vaccine rates are steadily increasing across the U.S., so are trends in both case numbers and hospitalization rates.The exterior of the Center for Disease Control (CDC) headquarters is seen.