鸡新城疫Lasota-传染性支气管炎W93二联活疫苗研制

鸡新城疫（ＮＤ）Ｌａｓｏｔａ和肾变病型传染性支气管炎（ＮＩＢ）Ｗ９３弱毒经１０日龄ＳＰＦ鸡胚同胚培养，收获含毒鸡胚液，制成Ｌａｓｏｔａ－Ｗ９３二联活疫苗。经实验室检测和临床应用证明，用于预防ＮＤ和ＮＩＢ效果好。

重组鸡痘病毒表达的鸡IL-1β和IL-2以及cMGF对新城疫LaSota疫苗免疫效果的影响

将128只10日龄SPF鸡随机分成8组,每只免疫1 PD_(50)的新城疫LaSota疫苗；同时Ⅰ～Ⅵ组鸡分别皮下注射不同剂量的重组鸡痘病毒rFPV-IL-1β、rFPV-IL-2或cMGF,而Ⅶ组和Ⅷ组鸡分别皮下注射鸡痘病毒wt-FPV和PBS作为阴性对照和空白对照。结果,重组鸡痘病毒表达的IL-1β、IL-2或cMGF可以消除鸡痘病毒在免疫后第7d对雏鸡体重增长的影响；一定剂量的IL-1β和IL-2可使鸡脾中CD4^+T细胞在免疫后第7d和CD8^+T细胞在免疫后第14d的总体水平提高；免疫第21d新城疫F48E8强毒攻毒后,一定剂量的IL-1β和IL-2能提高免疫保护率,而cMGF却无此作用。结果表明,重组鸡痘病毒表达的IL-1β和IL-2在一定剂量下可增强新城疫LaSota疫苗的免疫效果。

免疫不同的IBD中等毒力活疫苗对ND(LaSota)疫苗体液免疫应答影响

维扬麻鸡150只分为5组(即Ⅰ-Ⅴ组).其中I、Ⅱ、Ⅲ组为试验组,对应用市售的A、B、C三种lBD中等毒力活疫苗进行两次免疫接种,Ⅳ组为ND免疫对照组,Ⅴ组为空白对照组,在IBD活疫苗二免后定期监测鸡群免疫ND(LaSota)疫苗后的HI抗体消长情况,以评价这3种IBD活疫苗对NDHI抗体产生的影响程度。结果发现,I组(免疫A疫苗)对NDV的HI抗体水平的影响最大,Ⅱ组(免疫B疫苗)对NDV的HI抗体水平的影响次之,Ⅲ组(免疫C疫苗)对NDV HI抗体水平的影响轻微。

Profile of Maternally Derived Antibody in Broiler Chicks and In-Ovo Vaccination of Chick Embryo against Newcastle Disease

In this study, we determined the suitability of lentogenic LaSota and naturally occurring avirulent I2 vaccine strains of Newcastle disease (ND) virus for efficacious in-ovo vaccination of broiler chickens. A total of 114 embyonated eggs divided into five groups (A, B, C, D and E) consisting of 25 eggs in each of groups A and B, 20 eggs in each of groups C and D and 24 eggs in group E were used in the study. Eighteen-day-old embryonated eggs in group A were vaccinated in-ovo with ND-I2 vaccine while the same age of embryos in group B were vaccinated with ND-LaSota. Thirteen-day-old embryonated eggs in groups C and D were vaccinated with ND-I2 and ND-LaSota respectively. Group E served as unvaccinated control. There was significant difference (p 2) used for the in-ovo vaccination were pathogenic for chick embryos, however, ND-I2 vaccine was better tolerated when administered to 18-day-old chick embryo.