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Covid's toll in the U.S. reaches 1 million deaths

The U.S. on Wednesday surpassed 1 million Covid-19 deaths, according to data compiled by NBC News — a once unthinkable scale of loss even for the country with the world's highest recorded toll from the virus.

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What the latest omicron subvariants mean for reinfection risk

... research shows antibodies obtained from vaccination or infection gradually wane over time, and each new omicron subvariant, though still a part of the larger omicron family tree, is slightly different from the last, meaning a person's ability to fight off infections from the virus can shift.

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