Cohort 1: Patients with confirmed COVID-19

Cohort 2: Healthcare workers on the front line of treating patients with COVID-19

Cohort 3: Close contacts of patients with confirmed COVID-19

Cohort 4: Regional contacts of patients with or at risk of COVID-19

Cohort "V": All persons who receive a vaccine against COVID-19


Study approach 1: Electronic health records tracking of risks and outcomes

Study approach 2: Prospective continuous data collection

Study approach 3: Continuous remote monitoring

Study approach 4: Regional data monitoring

Study approach 5: Meta-analyses