Objective To examine the effect of oral Bordetella pertussis on the asthma mice sensitized by ovalbumin(OVA),and explore the possible mechanism.Methods Culture the B.pertussis in Bordet-Gengou agar containing 25% rabbit blood.Collect the bacteria and inactive them at 80 ℃ for 30 min to get whole killed B.pertussis.32 BALB/C mice were randomly divided into control group,model-control group,model group and treatment group.The mice were sensitized and challenged with OVA to establish asthma model.Asthma mice in treatment group were orally administrated with B.pertussis 7 days before sensitization.The mice in control group and model-control group were challenged with saline.After 24 hours of last challenge,bronchoaveolar lavage fluid(BALF)and peripheral blood were collected.The total cells and eosinophils were counted in BALF.Results Compared with the control group(2.03±0.42,0.33±0.82)×105 mL-1 and model-control group(2.16±0.48,0.16±0.41)×105 mL-1,the total cells(10.13±1.33)×105 mL-1 and eosinophils(11.83±4.573)×105 mL-1 in BALF were more in asthma mice(P<0.01).The number of total cells(5.50±1.55)×105 mL-1 and eosinophils(0.66±0.82)×105 mL-1 in BALF were reduced in asthma mice treated with B.pertussis compared with asthma mice(P<0.01).Conclusions Oral B.pertussis can inhabit airway inflammation of asthma mice and has the potential of treating asthma. Objective To examine the effect of oral Bordetella pertussis on the asthma mice sensitized by ovalbumin (OVA), and explore the possible mechanism. Methods Culture the B.pertussis in Bordet-Gengou agar containing 25% rabbit blood. Collect the bacteria and inactive them at 80 ℃ for 30 min to get whole killed B.pertussis.32 BALB / C mice were randomly divided into control group, model-control group, model group and treatment group. The mice were sensitized and challenged with OVA to establish asthma model. Asthma mice in treatment group were orally administered with B.pertussis 7 days before sensitization.The mice in control group and model-control group were challenged with saline. After 24 hours of last challenge, bronchoaveolar lavage fluid (BALF) and peripheral blood were collected. The total cells and eosinophils were counted in BALF. Results compared with the control group (2.03 ± 0.42,0.33 ± 0.82) × 105 mL-1 and model-control group (2.16 ± 0.48,0.16 ± 0.41) × 105 mL- the total cells (10.13 ± 1.33) × 105 (5.50 ± 1.55) × 105 mL-1 and eosinophils (0.66 ± 0.82) in BALF compared with those in eosinophils (11.83 ± 4.573) × 105 mL- × 105 mL-1 in BALF were reduced in asthma mice treated with B. pertussis compared with asthma mice (P <0.01) .Conclusions Oral B.pertussis can inhabit airway inflammation of asthma mice and has the potential of treating asthma.