IL6 and chronic obstructive pulmonary disease: The ECC-BYF III, ER, ECC-BYF III + ER, and NAC groups had lowers IL-6 levels and higher IL-10 levels in BALF compared with the disease model group (P<0.01), which indicated ECC-BYF III, ER, the combination of ECC-BYF III and ER, and NAC inhibited airway inflammation in COPD rats.