CXCR5 and allergic asthma: We found a lower frequency of CXCR5+ Tfh or Tfh1 subtypes and a higher frequency of CXCR5+ICOS+ Tfh, CXCR+ICOS+PD-1+ Tfh, Tfh2 or Tfh17 subtypes in children with allergic asthma.