CXCL5 and neuromyelitis optica: A few studies have reported the cerebrospinal fluid (CSF) levels of these chemokines in patients with MS 9, 10 and one study has reported the elevated plasma level of CXCL5 in NMO patients during remission,11 but little is known about the CSF levels of these neutrophil‐related chemokines in NMO patients during relapse.