Scientists in South Africa tracking the spread of Omicron said Thursday they are seeing a rise in coronavirus reinfections in people who had recovered from Covid-19 as the country reported another sharp daily rise in new cases.

The scientists’ conclusions suggest previous infection provides less protection against the new variant than against earlier versions. “Previous infection used to protect against Delta, and now with Omicron it doesn’t seem to be the case,” Professor Anne Von Gottberg from the National Institute for Communicable Diseases in Johannesburg said Thursday.

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