To further examine whether inhibiting IL-19 and its receptor (IL-20R1) protected rodents against asthma, we used Dermatophagoides pteronyssinus (Der p; house dust mites) to induce chronic airway inflammation in wild-type C57BL/6 and IL-20R1-deficient mice and then analyzed the effect of the IL-20R1 deficiency on the pathogenesis of asthma. This evidence concerns the gene IL19 and asthma.