禽霍乱-新城疫二联油乳剂灭活疫苗研究（Ⅳ报）——疫苗的田间试验

1材料与方法 1．1二联营的制备与质量检验 1．1．1毒株来源与二联苗的制备。禽A型为杀性巴氏杆菌（APM）效力检验用强毒为C48．1株，鸡新城疫病毒（NDV）效力检验用强毒为北京株、APM1502株和NDVLaSota株，均购自中国兽药监察所。将APM强毒1502株培养菌液与NDV弱毒LaSota株感染鸡胚尿囊液混合，经甲醛溶液灭活后，按马闻天等的方法制备5批二联油乳剂灭活疫苗（批号05-1—05-5）。

Study on Inactivated Vaccine in Oil Emulsion Against Newcastle Disease and Fowl Cholera IV——Field Test of Vaccine

Objective] The aim of this study was to evaluate the clinical effect of the inactivated vaccine in oil emulsion against Newcastle disease and Fowl cholera, and provide conditions for combined prevention and control of Newcastle disease and Fowl cholera. Method] The mixture of avian pasteurella multocida (type A) virulent strain 1502 and Newcastle disease virus attenuated strain La Sota was prepared into five batches of the inactivated vaccine in oil emulsion to use in the field test for assessing its safety and effects on immune protection of chicken, duck and goose. Result] The field safety test showed that there was no adverse reaction in the vaccinated chickens, ducks and geese. The field test of immune effect for chickens suggested that the titers of hemagglutination inhibition antibody for Nescastle disease virus (ND-HI) in 7-14 day-old chickens and 60-90 day-old young chickens were 2-3 log2 higher than the control group after being vaccinated for 3 weeks, which could last for more than 4 months. The protection rate against avian pasteurella multocida was over 75.0% and its immune effect could last for 6 months. The field test of immune effect for duck and goose indicated that the titers of ND-HI antibody were all higher than 4.2 log2 in vaccinated ducks and geese while lower than 2 log2 in the control group after being vaccinated for 3 weeks. The protection rate against avian pasteurella multocida in vaccinated ducks and geese was higher than 75.0% and 62.5% respectively. Conclusion] The binary vaccine is safe for poultry and has good immune effects.