Fig. 6: SARS-CoV-2-specific T-cell (CD4+/CD4+ + CD8+) IFN-γ release plasma levels.
From: Robust immune response to COVID-19 vaccination in the island population of Greenland

T-cell interferon-γ release specific to the SARS-CoV-2 spike glycoprotein (measured in International Unit per millilitre, IU/mL) at Time 2 (approximately 11 months after second vaccine dose). By age groups (a) and by Inuit ethnicity (b). The boxplots present the lower quartile, median, and upper quartile, and the error bars indicate 95% CI. Dotted line indicates a cut-off level of 0.15 IU/mL (positive reaction).