Dominant coronavirus mutant contains ghost of pandemic past
The coronavirus mutant that is now dominant in the United States is a member of the omicron family but scientists say it spreads faster than its omicron predecessors, is adept at escaping immunity and might possibly cause more serious disease. Why? Because it combines properties of both omicron and delta, the nation's dominant variant in the middle of last year. A genetic trait that harkens back to the pandemic's past, known as a “delta mutation," appears to allow the virus "to escape pre-existing immunity from vaccination and prior ...
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