This is stated in a preprint published on the bioRxiv portal.

The preprint will have to be reviewed by experts in the future.

The report refers to the need for careful monitoring of this group of viruses in connection with their "potential of occurrence in humans."

Earlier, the head of Rospotrebnadzor, Anna Popova, said that almost all those infected with the Omicron coronavirus strain in South Africa did not have immunity against COVID-19. 

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