Abstract: The subject application provides various compositions of matter directed to West Nile virus (WNV) polypeptides and fragments thereof and polynucleotides, vectors and transformed host cells that encode, direct the expression of, or produce WNV polypeptides as set forth herein. Methods of using the polypeptides and polynucleotides for the production of immune responses in individuals or detecting the presence of WNV specific or neutralizing antibodies are also provided herein.