U.S. to escalate surveillance, study of coronavirus variants

"Мир делится на два класса — одни веруют в невероятное, другие совершают невозможное." Оскар Уайлд ZMEY
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By Susan Cornwell and Steve Gorman WASHINGTON (Reuters) — The U.S. Centers for Disease Control and Prevention is stepping up its efforts to track coronavirus mutations to ensure that COVID-19 vaccines and treatments stay ahead of new variants of the disease until collective immunity is achieved, the CDC chief said on Sunday. Dr. Rochelle Walensky spoke about implications posed by the rapidly evolving virus during a Fox News Sunday interview as the number of Americans known to have been infected neared 25 million, with more than 417,000 dead, just over a year after the first U.S. case of COVID-…

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