There is provided a polypeptide having an amino acid sequence selected from SEQ ID NOs:1, 2 and 3 or a functional fragment thereof, or comprising an amino acid sequence at least 65% identical to any one of SEQ ID NOs:1, 2 or 3. There is also provided a method of rapidly vaccinating an animal against infection by a pestivirus comprising administering to the animal an effective amount of a polypeptide comprising an E2 epitope polypeptide and/or an NS3 epitope polypeptide the E2 epitope polypeptide may be SEQ ID NO:1 and the NS3 epitope polypeptide may be SEQ ID NO:2 or 3, or functional fragments thereof.
