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Print The coronavirus variant first seen in Los Angeles in July now accounts for about 44% of new infections in Southern California and more than a third of new infections throughout the state, researchers reported Thursday. In addition, the variant has spread across the United States and to six countries around the globe, according to the study in the Journal of the American Medical Assn. It “remains uncertain” whether the genetic changes that characterize the fast-moving variant have improved its ability to transmit from person to person, or to make people infected with it sicker, a tea...

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.

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 w

How long immunity lasts from natural infection is one of the big questions of the pandemic. Recent global developments have scientists worried that the calculation is changing

READ MORE: 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 two per cent of people who previously had an earlier version of the virus. In Brazil, several similar cases were documented with a new variant there. Researchers are exploring whether reinfections help explain a recent surge in the city of Manaus, where three-fourths of residents were thought to have been previously infected. In the United States, a study...