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