Omicron would be able in a significant number of cases to reinfect those who have already had the covid: it results from a preliminary study, under review for MedRxiv. The survey is based on the analysis of 2 million 796 thousand people with sars-Cov2 in South Africa between March 2020 and November 2021.Omicron “is associated with a significant ability to evade the immunity acquired from previous infections” with the covid virus. “There is no clear epidemiological evidence of a similar ability with the Beta or Delta variants”. It is not known if Omicron “is able to ‘evade’ the immunity given by vaccines, or if it reduces it”.
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