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Explainer: Are new coronavirus strains cause for concern?

New variants of the virus have been found in Britain and South Africa.

(Anna Moneymaker | The New York Times via AP, Pool) Speaker of the House Nancy Pelosi, D-Calif., receives a Pfizer-BioNTech COVID-19 vaccine shot by Dr. Brian Monahan, attending physician Congress of the United States in Washington, Friday, Dec. 18, 2020.