Another embodiment of the invention provides a method of generating an immune response in an animal comprising administering one or more purified polypeptides having at least 95% identity to SEQ ID NOs:22 33 or a combination thereof to {HEAD ~ the animal}, wherein {TAIL ~ the one or more purified polypeptides} generate an immune response in the animal 
wherein
Another embodiment of the invention provides a method of generating an immune response in an animal comprising administering one or more purified polypeptides having at least 95 % identity to SEQ ID NOs:22 33 or a combination thereof to { HEAD ~ the animal } , wherein { TAIL ~ the one or more purified polypeptides } generate an immune response in the animal
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