If you've had omicron, are you safe from infection by the ne

New versions of omicron are circulating in the United States and South Africa. Two new studies shed light on the potential for future surges — and the risk factor if you've already had omicron.

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New York , United States , South Africa , New Jersey , Americans , Pei Yong Shi , Michaeleen Doucleff , Ari Shapiro , Shishi Luo , Atlantic States , University Of Texas Medical Branch In Galveston , Texas Medical Branch ,