Allergen house dust mite

A polypeptide comprising an amino acid sequence having at least 60% identity with the amino acid sequence SEQ ID No. 1 or comprising at least one amino acid fragment of at least 8 consecutive amino acid residues of the amino acid sequence SEQ ID No. 1 or having immunological cross-reactivity to the amino acid sequence SEQ ID No. 1 or fragments thereof, wherein the amino acid sequence SEQ ID No. 1 encodes an allergen and the polypeptide comprises at least one T cell epitope recognized by a receptor-specific T cells to a molecule having the amino acid sequence SEQ ID No. 1.