Keywords: Ep, Echinacea complex; sRaw, specific airway resistance; CBF, ciliary beat frequency; NO, nitrogen oxide; BALF, bronchoalveolar lavage fluid; Th2 cytokine, T helper cell cytokine; IL-1-β, IL-4, IL-5, IL-6, IL-10, IL-13, interleukins 1, 4, 5, 6, 10, 13; TN