CXCL10 and chronic obstructive pulmonary disease: Notably, the expression of CXCL10 (IP10), a chemoattractant for type I lymphocyte and NK cells, and previously proposed as a biomarker of human HRV infection and exacerbation of COPD [30], significantly increased 3.4 fold higher in asthmatic cells after viral infection, compared to non-asthmatic cells (p = 0.005).