CXCR3 and COVID-19: Coculture of CXCR3+ TFH or CXCR3− TFH cells with autologous memory B cells from COVID-19 convalescents and vaccinees showed that CXCR3+ TFH cells were more able than CXCR3− TFH cells to support spike-specific memory B cell differentiation into ASCs.