Inclusion Criteria:  Included in a health plan covered by HealthVerity database Covered by a health plan during at least 1 period of interest (pre-COVID-19, active-COVID-19, and post-EUA periods), but not necessarily the full period. Demonstrate an AESI specified clean period of continuous baseline enrollment or activity before the period of interest (pre-COVID-19, active-COVID-19, and post-EUA periods) during which the participant is covered.  Exclusion Criteria:  None