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Reuters HealthThe highly contagious variant of COVID-19 first discovered in the United Kingdom has become the most common strain of the virus in the United
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The highly contagious variant of COVID-19 first discovered in the United Kingdom has become the most common strain of the virus in the United States as cases continue to climb, a top U.S. health official said on Wednesday. https://t.co/hXAj0I0YgC - view on twitter