The interferon (IFN)-γ/interleukin (IL)-4 ratio (a) and IgE levels (b) in the bronchoalveolar lavage fluid of control rats (C), sensitized rats (S), sensitized rats treated with dexamethasone (S + D) and Allium cepa (35, 70, and 140 mg/kg/day) (S + AC). * p < 0.05, ** p < 0.01, *** p < 0.001, vs. group C; ++
p < 0.01, +++
p < 0.001, vs. group S; #
p < 0.05, ###
p < 0.001, vs. group S + D.