Dominant coronavirus mutant contains ghost of pandemic past
In 2020. The coronavirus mutation 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 because it combines properties of both omicron and delta, the nation's dominant variant in the middle of last year. A genetic trait that harks back to the pandemic's past known as delta mutation appears to allow the virus to escape preexisting immunity from vaccination and prior infection, especially if you were infected in the omicron wave, said doctor Wesley long, a pathologist at Houston methodist in Texas. That's because the original omicron strain that swept the world didn't have the mutation. The omicron sub variant gaining ground in the U.S. known as BA two 12 one and responsible for 58% of U.S. COVID-19 cases last week isn't the only one affected by the delta mutation. The genetic change is also present in the omicron relatives that together dominate in South Africa, known as BA four and BA 5.