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A person performs a self-swab test for COVID-19 in the Brooklyn borough of New York, the United States, Dec. 17, 2021. Michael Nagle | Xinhua News Agency | Getty Images People infected with the heavily mutated omicron variant of Covid-19 may have increased immune protection against delta, a new study says. As a consequence, omicron
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Healthcare workers prepare Covid-19 tests at a Nomi Health testing site in Omaha, Nebraska, on Wednesday, Nov. 10, 2021. Dan Brouillette | Bloomberg | Getty Images An investigation into a cluster of omicron infections in Nebraska suggests the heavily mutated variant has a shorter incubation period and causes similar or milder symptoms compared to past
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