More than two-thirds of cases of the Omicron variant of COVID-19 are among people who have been reinfected with the virus, a new study said Wednesday.

Imperial College London researchers reported that around 3,582 people — or about 66% of participants in the study — who tested positive in January had already been infected with the virus, CNBC reported. //

In December, UK health officials also estimated that the risk of reinfection with the Omicron variant was about 5.4 times greater than with Delta.