Fig. 5From: Low human beta-defensin-2 levels in the sputum of COPD patients are associated with the risk of exacerbationsVirus correlation network analysis. At the time of exacerbation, the levels of cytokines, such as CXCL10, CXCL11, and IFN-γ, were significantly associated with virus colonization in patients. Virus-related cytokines are colored red; other cytokines are colored light green (for more details, see the Statistical analysis section)Back to article page