TCF7 and influenza: Individuals with SAS‐1high‐MAS‐1low status prior to influenza or SARS‐CoV‐2 vaccination maintained lower pathogenic triad burdens, higher TCF7 levels, and elevated expression of gene signature modules linked to lymphocyte subsets (e.g., plasma cells) associated with superior vaccine responsiveness [Figures S11–S21; (Arunachalam et al. 2021; Li et al. 2014)].