An antigen-presenting system (APS) comprising one or more antigens in combination with a papaya mosaic virus (PapMV) or a virus like particle (VLP) derived from papaya mosaic virus is provided. Specifically an APS comprising one or more influenza virus antigens is provided. The APS can be used, for example, as a vaccine against influenza. The one or more antigens comprised by the APS can be conjugated to a coat protein of the PapMV or PaPMV VLP, or they may be non-conjugated (i.e. separate from the PapMV or PapMV VLP). Conjugation can be, for example, by genetic fusion with the coat protein, or binding via covalent, non-covalent or affinity means.