Secondary Databased Post-marketing Surveillance Study of BNT162b2

1. Primary Objectives 1-1. Measure of Occurrence Inclusion Criteria For the measure of occurrence, analytical populations will include following individuals, * Who meet the predefined criteria for each study population. * With enrollment in the national insurance during the observation period, as well as during the clean window prior to the start of the observation period. Exclusion Criteria For the measure of occurrence, analytical populations will exclude following individuals, * With diagnosis of AESI during the AESI-specific clean window; or * With diagnosis of AESI between first dose and second/third dose of primary series when analyzing for the second/third dose. 1-2. Measure of Association Inclusion Criteria For the measure of association, analytical populations will include following individuals, * Who meet the predefined criteria for each study population. * With enrollment in the national insurance during the observation period, as well as during the clean window prior to the start of the observation period; and * Who had incident AESI during the observation period. Exclusion Criteria For the measure of association, analytical populations will exclude following individuals, * Who do not have both risk and control window time. If an individual disenrolls, dies, or reaches the end of the study period during the risk window prior to accumulating any control window time, he/she will be excluded; or * With a diagnosis of AESI during the AESI-specific clean window. 2. Secondary Objective Inclusion Criteria For the secondary objective, the study populations will include following individuals, * Who meet the predefined criteria for each study population. Exclusion Criteria * None