Disclosed is an immunogenic polypeptide having an amino acid sequence comprising at least one sequence selected from the group consisting of the SEQ ID NOs 1-16 or a variant thereof wherein said variant has a length of at least 8 amino acids, with the provisos that: i) said amino acid sequence does not comprise any sequence stretches derived from the HIV genome of a length of 8 or more amino acids other than an amino acid sequence according to any of SEQ ID NOs 1-16 or the variant thereof, and ii) when the immunogen comprises only one sequence selected from the group consisting of SEQ ID NOs 1-16, then this sequence is not selected from the group consisting of SEQ ID NO: 3, 5, 6 and 16, wherein SEQ ID NOs: 1-16 are disclosed within the specification.
