More than two-thirds of omicron cases are reinfections, study suggests

…When previous variants of Covid were circulating among populations, it was thought that a prior Covid infection, in which people had caught the virus and recovered, could offer some protection from reinfection. But there is concern that this is not the case with omicron, with U.K. health officials estimating in December that the risk of reinfection with omicron is 5.4 times greater than it is with the delta variant…

https://www.cnbc.com/2022/01/26/more-than-two-thirds-of-omicron-cases-are-reinfections-study-suggests.html