MUC5AC and rhinitis: Although more aspects deserve further research, as further in vivo studies and clinical trials in patients with rhinitis during longer periods of time (for example during pollen seasons), the results of this study in the in vitro model of MucilAirTMNasal suggest that the application of Rhinosectan® does not impair ciliary movement, enhances mucociliary clearance and facilitates phagocytosis, while reducing mucin secretion, which are optimal properties for the management of rhinitis and associated conditions.