Consistent with that, the proportion of SARS-CoV-2–specific Tfh1 cells, a subpopulation of Tfh cells characterized with CXCR3+, correlated with the titers of anti-SARS-CoV-2 antibodies [33–35], suggesting that Tfh1 cells may positively contribute to the immune response against COVID-19. This evidence concerns the gene CXCR3 and COVID-19.