Figure 2.

CD4⁺ T cell cytokine responses against SARS-CoV-2 do not correlate to serum anti-RBD antibody levels. SARS-CoV-2-specific responses defined as in Figure 1 (x-axis) were compared to serum anti-RBD IgG antibody levels (y-axis). The vertical dotted line indicates 0.01% responding cells producing the indicated cytokine(s). (A) Relationship to IL-2-producing cells. (B) Relationship to IFN-γ-producing cells. (C) Relationship to cells producing both IL-2 and IFN-γ. (D) Relationship to cells producing either IL-2 or IFN-γ or both. (E) Relationship to IL-17-producing cells. (F) Relationship to IL-4-producing cells. (G) Relationship to IL-10-producing cells.