/sci/ - Science & Math

>>14763571
>In total, 11 536 PCR-positive persons were included. The mean (SD) age was 34 (19) years (median, 31 years; range, 0-102 years), 5888 (51%) were male, 2942 (25.5%) had received at least 1 dose of
vaccine, and the mean (SD) time from initial infection was 287 (191) days (median, 227 days; range,
60-642 days). Reinfection was observed in 1327 persons (11.5%) during the Omicron period. Of those
who had received 1 dose or less of vaccine, 11.7% (1007 of 8598 individuals) were reinfected,
compared with 10.9% (320 of 2938 individuals) who had received 2 or more doses. The reinfection
rate was highest (475 of 3136 individuals [15.1%]) among those aged 18 to 29 years. Fewer
reinfections occurred among older individuals (Table).

>The probability of reinfection increased with time from the initial infection (odds ratio of 18
months vs 3 months, 1.56; 95% CI, 1.18-2.08) (Figure) and was higher among persons who had
received 2 or more doses compared with 1 dose or less of vaccine (odds ratio, 1.42; 95% CI, 1.13-1.78).
Defining reinfection after 30 or more days or 90 or more days did not qualitatively change
the results