Method for preventing influenza using a vaccine for intranasal administration

Vaccine composition for administration through the nasal mucosa comprising (i) an antigen of influenza virus, (ii) polyribocytidylic polyriboinosinic acid (poly (I: C)), poly (I: CXU) or poly (IXU : C), and (iii) a carboxyvinyl polymer, in which x is on average a number from 3 to 40.