Application of polypeptide in preparation of Newcastle disease vaccine adjuvant or immunopotentiation product

The invention belongs to the technical field of veterinary biological products, and particularly relates to application of a polypeptide in preparation of a Newcastle disease vaccine adjuvant or an immunopotentiation product. The amino acid sequence of the polypeptide is as shown in NPEVILPVPAFNVINGGSH. When the newcastle disease live vaccine is injected into chickens, the NH-19 polypeptide is orally taken or subcutaneously injected, so that the immune effect of the newcastle disease live vaccine can be improved, and the NH-19 polypeptide can be used as an immune adjuvant or an immune synergist. A good specific antibody is generated after vaccine immunization, and the NDV HI antibody level of a polypeptide group is higher than that of a healthy control group and that of a vaccine control group on the third day, the seventh day and the fourteenth day after immunization, which indicates that the polypeptide improves the immune effect of the NDV live vaccine. 本发明属于兽医生物制品技术领域，具体涉及一种多肽在制备新城疫疫苗佐剂或免疫增效产品的应用。所述的多肽的氨基