New variants raise worry about COVID-19 virus reinfections ...Middle East

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Evidence is mounting that having COVID-19 may not protect against getting infected again with some of the new variants. People also can get second infections with earlier versions of the coronavirus if they mounted a weak defense the first time, new research suggests. How long immunity lasts from natural infection is one of the big questions in the pandemic. Scientists still think reinfections are fairly rare and usually less serious than initial ones, but recent developments around the world have raised concerns. In South Africa, a vaccine study found new infections with a variant in 2% of people who previously had an earlier version of the virus. In Brazil, several similar cases were docu

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New variants raise worry about COVID-19 virus reinfections ...Middle East

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