CXCR3 and COVID-19: To address this question, bulk CXCR3+ and CXCR3− TFH cells were sorted from COVID-19 convalescents (n = 9), vaccinees (n = 7), and healthy controls (n = 8) and cocultured with autologous memory B cells (Fig. 7g, h and Supplementary Table 5), respectively.