CXCR5 and influenza: When we analyzed lymphocytes at 8, 15 and 42 days after influenza infection to evaluate differences in proliferation or contraction kinetics of CXCR5+BCL6+ GC Tfh cells, our data showed no differences in longitudinal kinetics of GC Tfh cells in this experiment and only significantly higher numbers of GC Tfh cells in heterologously primed mice at 8 dpi (Fig 4F).