US tracks virus variants as cases top 25m

Updated January 25 2021 - 4:54pm, first published 4:50pm
Despite the vaccination program ramping up, the United States has passed 25 million COVID-19 cases.
Despite the vaccination program ramping up, the United States has passed 25 million COVID-19 cases.

The US Centers for Disease Control and Prevention (CDC) is stepping up efforts to track coronavirus mutations and ensure vaccines and treatments remain effective against new variants.

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