The invention relates to novel peptide compositions. In particular, the invention relates to a peptide composition comprising at least two peptides which are selected from among the following peptides: a peptide A having at least the amino acid sequence of SEQ ID N.sub.o1, a peptide B having at least the amino acid sequence of SEQ ID N.sub.o45, a peptide C having at least the amino acid sequence of SEQ ID N.sub.o127, a peptide D having at least the amino acid sequence of SEQ. ID N.sub.o174. The inventive compositions can be used, in particular, in the preparation of active pharmaceutical compositions against the hepatitis C virus.