IL4 and inflammatory response: Severe pulmonary inflammation in FI-RSV alum immune mice showed correlations with high levels of infiltrating immune cells and granulocytes, particularly eosinophils, mucus and eotaxin production as well as IL-6 and IL-4 inflammatory cytokines in the lung and BAL fluids of alum-adjuvanted FI-RSV (FI-RSV-A) immune mice, which were not observed in mice with inactivated RSV (FI-RSV) alone immune mice.