World B.1.1.7 Variant Most Common Source of New U.S. Infections, C.D.C. Says April 7, 2021April 7, 2021Sheryl Gay StolbergComments Off on B.1.1.7 Variant Most Common Source of New U.S. Infections, C.D.C. Says The worrisome development comes as officials and scientists across the country warn of a fourth possible surge of the coronavirus.
