国内流行犬瘟热病毒DNA重组疫苗的初步研究

为了探究H蛋白的免疫原性以及抗体效价,构建了1株犬瘟热病毒(CDV)ZH-10株H基因的真核表达载体pCI-H,对表达产物的免疫原性进行了初步研究,并进行了小鼠的DNA免疫试验。结果显示,pCI-H免疫组血清可与感染病毒的MDCK细胞发生特异性IPMA反应呈现特异的棕红色;ELISA血清抗体滴度可达1:28~1:79;病毒中和抗体可达1:11~1:32。研究结果表明,H蛋白具有免疫原性,但诱导抗体效价不足,需进一步完善。     

Onderstepoort today, yesterday and tomorrow. Commemorative lecture

This lecture commences with a synopsis of the present activities and organization of the world-famous veterinary research institute in South Africa, colloquially and internationally known as Onderstepoort. Some of the major historic features which contributed to the origin, firm establishment and excellent reputation of Onderstepoort are subsequently outlined. Finally, the future of the institute is considered in terms of existing and expected scientific challenges.     

Effect of recombinant canine distemper vaccine on antibody titers in previously vaccinated dogs

Two canine distemper virus (CDV) vaccine types are currently commercially available: modified-live virus (MLV) vaccines and a canarypox recombinant CDV (rCDV) vaccine (Recombitek, Merial). This study compared the ability of the rCDV vaccine and MLV vaccines to significantly enhance (boost) the antibody response of previously immunized adult and juvenile dogs. A significant (fourfold or greater) increase in titer occurred in significantly more dogs revaccinated with Recombitek C-4 or Recombitek C-6 than with the MLV-CDV vaccines. This study demonstrates that Recombitek, the only vaccine for dogs containing rCDV, is more likely to significantly boost the CDV antibody response in previously vaccinated dogs than are the MLV-CDV vaccines. Because rCDV vaccine can boost the antibody titer of dogs previously vaccinated with an MLV vaccine, it can and should be used when core vaccines are readministered.