Variants have become a large part of the conversation among public health officials and epidemiologists. One variant from the U.K. known as B.1.1.7 is more transmissible than the strain that was dominant in the U.S. over most of the pandemic. The CDC tracks at least three other variants officially–B.1.351, P.1, B.1.427, and B.1.429. Worries are […]