IFNγ and IL-17 expression in CD8 T-cells specific for the S protein. Paired backgrounds from technical controls were removed from the data. (A–C) Percentage of IFNγ-CD8 T-cells specific for the S protein in healthy donors and oncologic patients. (D–F) Percentage of IL-17-CD8 T-cells specific for the S protein in healthy donors and oncologic patients. (A,B,D,E) Statistical significance was evaluated with the Kruskal–Wallis test, followed by Dunn´s pair-wise comparisons. (G) Percentage of CD8 T-cells expressing IL-17 and IFNγ expression in H-V donors that completed the vaccine regime before sample collection in the indicated timelines. (C,F,G) Significance was tested with the Mann–Whitney U-test. H-N/N—non-vaccinated, non-COVID-19 donors; H-CoV—healthy donors with previous COVID-19 infection; H-V—vaccinated healthy donor; H-CoV-V—vaccinated healthy donor with previous COVID-19; O-CoV—oncologic patient with previous COVID-19; O-V—vaccinated oncologic patients; O-CoV-V—vaccinated oncologic patients with previous COVID-19; *, **, *** and **** indicate significant (p < 0.05), very significant (p < 0.01), highly significant (p < 0.001) and very highly significant (p < 0.0001) differences, respectively.