Abstract: The present invention relates to certain polyphenol(s) having adjuvant property that can be used for the vaccine preparation. Also, the current invention provides adjuvant system comprising said polyphenol(s) and delivery system such as an immunostimulating reconstituted influenza virosomes (IRIVs). The present invention illustrates the said polyphenol(s) or an adjuvant system comprising of such polyphenol(s) and IRIVs can provide better level of immune response against antigen of interest than conventional vaccine systems. The preferred polyphenol according to the present invention can be beta-sitosterol. Beta-sitosterol can be optionally combined with the known adjuvant(s) to enhance immune response.

Abstract: The present invention is directed to a preparation of an adjuvant system to achieve required level of humoral and cellular immune response against antigen of interest. The current invention provides an adjuvant system comprising an immunostimulating reconstituted influenza virosomes (IRIVs) and immunopotentiators. The current invention illustrates that an antigen is adsorbed or incorporated into IRIVs and further formulated with lipophilic adjuvant such as MPL or glucopyranosyl lipid adjuvant (synthetic analogue of MPL).

Abstract: The present invention provides a virosome comprising a virosomal membrane comprising at least one lipid and envelope proteins of an enveloped virus and of the virosome and attached to said envelope proteins. Furthermore, the invention provides a vaccine comprising the virosome of the invention and, a method for the production of a virosome of the invention. Moreover, the invention provides a use of a virosome of the invention for the preparation of a vaccine, e.g. for the prevention or alleviation of a disease related to an HBV infection, and a method for the vaccination of a subject.

Abstract: The present invention provides a virosome comprising a virosomal membrane comprising at least one lipid and envelope proteins of an enveloped virus and of the virosome and attached to said envelope proteins. Furthermore, the invention provides a vaccine comprising the virosome of the invention and, a method for the production of a virosome of the invention. Moreover, the invention provides a use of a virosome of the invention for the preparation of a vaccine, e.g. for the prevention or alleviation of a disease related to an HBV infection, and a method for the vaccination of a subject.