FPS is more effective than FP or Sal alone in preventing AHR and lung inflammation. Mice were sensitized with OVA and infected with RSV as described in Methods. From days 10 to 13 mice were treated daily with FP, Sal or FPS. AHR was measured on day 14 (A). On day 15 the mice were sacrificed and a BAL cell differential was performed for macrophages (mac), eosinophils (eos), neutrophils (neut) and lymphocytes (lym) (B) and H & E stained lung sections were examined for histopathology (C). Results shown are one representative experiment of two.