Vaccination status
The vaccination status of all participants is shown in Table 2. A
greater proportion of unvaccinated (7.0%) individuals was in the case
group than in the control group (4.5%). Among the case group, 2.4%
completed a partial vaccination, and 58.7% completed a full
vaccination, whereas, among the control group, the corresponding
proportions were 1.2% and 53.7%, respectively. A total of 132 (31.9%)
individuals had completed a booster vaccination in the case group, and
336 (40.6%) in the control group before the outbreak in April 2022.
There was a significant difference in vaccination status between the
case and control groups (P = 0.006).