Eythorsson et al. in ICELAND in 2022 reported that with the COVID vaccine, probability of reinfection was higher among persons who had received 2 or more doses compared with 1 dose or less of vaccine

by Paul Alexander

During the Omicron Wave of Infections in Iceland, December 1, 2021, to February 13, 2022; The reinfection rate was highest (475 of 3136 individuals [15.1%]) among those aged 18 to 29 years.

‘In this population-based cohort study, a substantial proportion of persons experienced SARS-CoV-2 reinfection during the first 74 days of the Omicron wave in Iceland, with rates as high 15.1% among those aged 18 to 29 years. Longer time from initial infection was associated with a higher probability of reinfection, although the difference was smaller than expected. Surprisingly, 2 or more doses of vaccine were associated with a slightly higher probability of reinfection compared with 1 dose or less.’