Two thirds of Omicron cases previously had Covid-19, study finds

Around two thirds of people who have been infected with the Omicron variant had already had Covid-19. New data underlines the ability of the now-dominant strain to evade the immune response generated by prior infection. The study also estimates that an unprecedented one in 23 people were infected with the coronavirus in January. A huge surge of infections, which saw the daily count hit a new record of more than 200,000, meant the prevalence in the general population between January 5 and 20 (4.41%) was higher than at any point since March 2020.