CXCR5− Tph, CXCR5−ICOS+ Tph, CXCR5−ICOS+PD-1+ Tph, CXCR5+ICOS+ Tfh and CXCR5+ICOS+PD-1+ Tfh increased in children with allergic asthma. Here, ICOS is linked to allergic asthma.