The more contagious coronavirus variant may soon be the U.S.’s dominant strain
More rigorous efforts to vaccinate, wear masks and social distance are needed to curb its spread, CDC says
![health care worker receives vaccine](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/01/011521_EG_covid-strain_feat.jpg?fit=1030%2C580&ssl=1)
A health care worker receives the Pfizer-BioNTech COVID-19 vaccine in Pompano Beach, Fla., on January 6. A new CDC study suggests that a new highly contagious coronavirus variant may cause most U.S. cases in about two months.
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