Of particular importance for the proposed link between RSV and asthma, IL-5 was markedly reduced in RRR compared to CRR weanlings during recurrent postnatal rrRSV LRTI (360.6 ± 55.77 pg/ml vs. 488.1 ± 17.92 pg/ml; P˂0.05). The gene discussed is IL5; the disease is asthma.