Abstract: The present invention is related to a compound for the prevention and/or the treatment of allergy consisting of: at least one allergen antigenic determinant which is recognized by a B cell or an antibody secreted by a B cell of a non-atopic individual to said allergen, and at least one antigenic determinant of an antigen different from said allergen which triggers T cell activation.

Abstract: The present invention is related to a method for modulating the immune system of a mammal patient towards an allergen, which comprises the step of inducing a pre-sensitisation of the immune system of said patient towards an immunogen carrying at least one T cell epitope homologous and functionally similar to an epitope present on said allergen and deriving from a naturally-occurring antigen in order to modify the response of said patient to a further sensitisation to said allergen, allowing that the immune response towards the allergen is modulated and that no allergy towards said allergen towards said allergen will be developed in said patient.