›› 2012, Vol. 39 ›› Issue (6): 231-234.

• 经验交流 • 上一篇    下一篇

牛病毒性腹泻弱毒活疫苗免疫持续期的研究

张淑琴1, 郭利1, 王炜1, 张亭亭2, 吴永旺2, 武华1   

  1. 1. 中国农业科学院特产研究所,吉林吉林 132109;
    2. 北京必威安泰生物科技有限公司,北京 100176)
  • 修回日期:2011-11-09 出版日期:2012-06-20 发布日期:2012-07-02
  • 通讯作者: 武华。E-mail:wuhua@bvbio.com E-mail:wuhua@bvbio.com
  • 作者简介:张淑琴(1978-),女,内蒙古人,博士,助理研究员,主要从事动物病毒和生物制品的研究。
  • 基金资助:
    牛羊重大疫病防控技术研究与产业化项目(200803018);动物疫苗耐热保护剂及冻干技术研究与开发项目(2009BADB4B02)。

The Efficacy of the Live Attenuated Bovine Viral Diarrhea Virus SM Vaccine Strain

ZHANG Shu-qin1, GUO Li1, WANG Wei1, ZHANG Ting-ting2, WU Yong-wang2, WU Hua1   

  1. 1. Institute of Special Economic Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Jilin 132109, China;
    2. Beijing Bigvet Biotech Co., Ltd., Beijing 100176, China
  • Revised:2011-11-09 Online:2012-06-20 Published:2012-07-02

摘要: 为检测牛病毒性腹泻病毒(BVDV)弱毒活疫苗在免疫牛体内抗体产生及其消长规律,评价弱毒疫苗的保护效力,并确定免疫持续期,本试验对免疫试验牛每头颈部肌肉接种BVDV SM株弱毒疫苗104.5TCID50/头,监测血清抗体效价,进行免疫持续期的确定。在疫苗免疫后的6、9和12个月分别抽取5头免疫组和5头对照组牛采用BVDV-JL强毒株进行攻毒试验,每头牛攻毒剂量为6×107.0 TCID50/mL。结果显示疫苗免疫后12个月时血清中和抗体效价仍维持在1∶1048以上,攻毒结果显示3个时间点强毒攻击后,免疫组所有动物白细胞数量都没有下降也没有分离到病毒,而对照组动物白细胞数下降均超过30%,6和9个月动物均分离到病毒,而12个月对照组动物由于年龄大,没有分离到病毒,因此暂定此疫苗的免疫持续期为9个月。

关键词: 牛病毒性腹泻病毒; 弱毒活疫苗; 免疫持续期; 保护效果

Abstract: The study was designed to evaluate neutralizing (SN) antibodies against bovine viral diarrhea virus (BVDV) in the calves vaccinated with the live attenuated bovine viral diarrhea virus SM vaccine. A total of 30 healthy calves at weaning were randomly divided into two groups, with 15 calves in vaccinate group and 15 in control group. The attenuated BVDV SM vaccine strain was administrated via intramuscular injection on the neck at a single dose and challenged with a virulent BVDV-JL virus by nasal spray. The blood samples were collected at different time points for monitoring SN antibody titers. The results indicated that the SN antibody titers in the vaccinated calves maintained at a relative high level until 12 month post-vaccination, and the vaccinated calves were effectively protected from the challenge, as detected by the white blood cell count (WBC) and virus shedding. Therefore, the duration of immunity of the vaccine was at lease for 9 months.

Key words: bovine viral diarrhea virus (BVDV); live attenuated vaccine; duration of immunity; protectio effect

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