This study is a retrospective, non-interventional, observational study using Korean Disease Control and Prevention Agency-COVID-19-National Health Insurance Service (K-COV-N) database that includes COVID-19 vaccination/infection and claims data in Korean population. For the primary objective, cohort and self-controlled design will be used for measure of occurrence and measure of association, respectively. For the secondary objective, cohort design will be used for measure of occurrence.
Primary objective:
* To describe the frequency and estimate the incidence ratio of adverse events of special interest (AESIs) following exposure to Comirnaty Injection among individuals aged 6 months or older in the Republic of Korea
* To evaluate the relative risk of AESIs following exposure to Comirnaty Injection among individuals aged 6 months or older in the Republic of Korea, using a self-controlled case series (SCCS) design
Secondary objective:
\- To describe the frequency and estimate the incidence ratio of severe COVID-19 outcomes (COVID-19 hospital admission, COVID-19 intensive care unit \[ICU\] admission, and COVID-19 death).
