November 9, 2023
Intrinsic and Effective Severity of Coronavirus Disease 2019 Cases Infected with the Ancestral Strain and Omicron BA.2 Variant in Hong Kong | T-Cell Immunity Against Severe Acute Respiratory Syndrome Coronavirus 2 Measured by an Interferon-γ Release Assay Is Strongly Associated With Patient Outcomes in Vaccinated Persons Hospitalized With Delta or Omicron Variants