CD40LG and COVID-19: To quantify SARS‐CoV‐2 reactive CD4 T cells in individuals who recovered from COVID‐19 at least 9 months post recovery, PBMCs were cultured with peptide pools from the Nucleocapsid (N) or Spike (S1) (S2) regions of SARS‐CoV‐2 and CD4 T cells were analysed via flow cytometry for upregulation of Th1‐related cytokines IFNγ, IL‐2 and TNFα as well as expression of CD154 (representative gating shown in Figure S1).