We present computational modeling of COVID-19 transmission and intervention strategies including vaccination and social-distancing. Furthermore, epidemiological distributions of the coronavirus disease 2019 (COVID-19), including the intervals from symptom onset to diagnosis, reporting, or death, are important for developing effective disease-control strategies. COVID-19 case data from a national database maintained by the Korea Disease Control and Prevention Agency (KDCA) and the Central Disease Control Headquarters were analysed.