1. Receipt of a SARS-CoV-2 (also known as COVID-19) vaccine after enrollment into TICO. Participants who received a SARS-CoV-2 vaccine prior to enrollment in TICO may be enrolled in this substudy 2. Known allergy to any component of the study eligible vaccine(s)

1. Receipt of a SARS-CoV-2 (also known as COVID-19) vaccine after enrollment into TICO. Participants who received a SARS-CoV-2 vaccine prior to enrollment in TICO may be enrolled in this substudy 2. Known allergy to any component of the study eligible vaccine(s)