For instance, Quint et al. examined serum interferon gamma-induced protein (IP)-10 as a potential biomarker of HRV infection and reported that COPD patients (n = 136) had higher serum IP-10 levels than age-matched controls without COPD (n = 70), which also correlated with sputum HRV viral load. Here, CXCL10 is linked to chronic obstructive pulmonary disease.