Rubella virus antigen, characterized in that it is a rubella virus E1-E2 envelope protein complex construct (synonym: rubella spike construct), comprising at least one E1 component and one E2 component which are connected - wherein the E1 component consists of the E1 coat protein, whose C-terminal transmembrane region and intravirional domain are removed and whose N-terminus comprises the ectodomain of the E1 coat protein, - and where the E2 component consists of the E2 coat protein , whose transmembrane regions and intravirional domain are removed and whose N-terminus comprises the ectodomain of the E2 coat protein, - and the C-terminus of the E2 component is connected to the N-terminus of the E1 component directly or by means of a linker.
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