Patent ID: 7767212

Claim:
A composition comprising: (a) a core particle with at least one first attachment site, wherein said core particle is a virus-like particle (VLP) of an RNA-bacteriophage, (b) at least one antigen with at least one second attachment site, wherein said at least one antigen is a Fel d1 protein, wherein said Fel d1 protein is a fusion protein comprising chain 1 of Fel d1 and chain 2 of Fel d1, wherein said chain 2 of Fel d1 is fused via its C-terminus to the N-terminus of said chain 1 of Fel d1 via a spacer consisting of an amino acid sequence having 10-20 amino acid residues, and wherein (a) and (b) are covalently linked through said at least one first and said at least one second attachment site.