About 73% of U.S. Estimated to Be Immune to Omicron Variant

About 73% of Americans are now immune to the Omicron variant, which could increase to 80% by mid-March, a university health institute says.

About half of eligible Americans have received booster shots, and about 80 million confirmed COVID-19 infections have been reported. Many more infections have occurred but haven’t been officially recorded, The Associated Press reported.

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The high percentage of immunity from vaccination and previous infection tends to prevent or shorten new illnesses and reduce the amount of virus circulating overall. Health experts are now discussing whether the number is high enough to stop new waves or reduce the burden on hospitals.

“I am optimistic even if we have a surge in summer, cases will go up, but hospitalizations and deaths will not,” Ali Mokdad, PhD, a professor of health metrics sciences at the University of Washington in Seattle, told the AP.

Mokdad works on COVID-19 forecasting for the university’s Institute for Health Metrics and Evaluation, which has been a reliable model during the pandemic. Mokdad calculated the 73% number for the AP.

“We have changed,” he said. “We have been exposed to this virus and we know how to deal with it.”

The U.S. is now reporting about 125,000 new cases per day, according to the data tracker from The New York Times, marking a 68% decrease from the past 2 weeks. Hospitalizations are also down 39%, and about 2,300 new deaths are being reported daily, marking a 13% decline.

There will be more outbreaks as new variants emerge, immunity wanes, and some people remain unvaccinated, Mokdad said. But the coronavirus is no longer new, and the entire population is no longer “immunologically naive.” Scientists are now trying to understand how long booster protection will last against Omicron and how many people have been infected who had mild or no symptoms that were never reported.

By the end of the Omicron surge, about three out of four people in the U.S. will have been infected, Shaun Truelove, PhD, an epidemiologist and disease modeler at Johns Hopkins University, told the AP.

“We know it’s a huge proportion of the population,” he said. “This varies a lot by location, and in some areas, we expect the number infected to be closer to one in two.”

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