The present invention relates to vaccines directed against antigens such as membrane proteins from pathogens or tumor cells. The invention further relates to methods of forming reconstituted viral membranes, with membrane fusion activity, which are lipid bilayer membranes preferably containing natural lipids of a virus, a viral fusion protein, one or more optional further antigens as well as amphiphilic adjuvants. Pharmaceutical compositions comprising such reconstituted viral membranes are also part of the invention.
