新城疫疫苗种类及其使用方法（Types and usage of Newcastle disease vaccine）.docVIP

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新城疫疫苗种类及其使用方法（Types and usage of Newcastle disease vaccine）.doc

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新城疫疫苗种类及其使用方法（Types and usage of Newcastle disease vaccine）

新城疫疫苗种类及其使用方法（Types and usage of Newcastle disease vaccine） Newcastle disease (ND) is a highly contagious viral disease of various species, age and gender of chickens are susceptible, morbidity and mortality in more than 90%, is one of the most serious disease of poultry production. In recent years, the western developed countries have adopted the method of killing the main group of strong poison, and have basically controlled the disease. In our country, because of the limitation of economic development and the prevalence of virulent infection, ND is mainly controlled by vaccination. Because of the wide variety of ND vaccines and different methods of vaccine use, the failure of vaccine selection and use will lead to the failure of immunization and bring great economic losses to the production of chicken. Several commercially available ND vaccines and methods of use are introduced as follows: 1 kinds of vaccines 1.1 medium virulence vaccines: H strain, Roakin strain, Mukteswar strain and Komorov strain, etc. Mukteswar strain (I line) is mainly used in our country. I vaccine can produce immunity quickly after use. It usually produces immunity after 3 days of injection, long duration of immunity, immunity period is 1~1.5 years, and the protection is strong. It is mainly used to strengthen the immunity of chickens with basal immunity. I vaccines are usually injected or inoculated, and can also be immunized with water and aerosol. After I injection, stress was more serious, which had some influence on the laying hen. Since the use of I system has the risk of toxicity, recurrence and toxicity, it is easy to cause recessive infection of chickens and chronic ND. The poultry farm should control the ND for a long time, and the IV system should be used carefully. The 1.2 attenuated vaccines included the two strains (B1 strain), the third line (F strain), the IV strain (Lasota strain), the V4 and the clone strain and so on. 1.2.1 II vaccine safety, no clinical response after u