COVID-19–Associated Hospitalization Surveillance Network flow diagram. Abbreviations: AI/AN, American Indian/Alaskan Native; API, Asian/Pacific Islander; COVID-19, coronavirus disease 2019; NH, non-Hispanic; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2. ^aWeighted %. bIndividual vaccinated with primary series only defined as having received 2 doses of a 2-dose series or 1 dose of a single-dose series ≥14 days before a positive SARS-CoV-2 test. Individuals were considered boosted if they were vaccinated with their primary series and received an additional dose.