Field trial on porcine parvovirus live vaccine for the prevention of viral stillbirth in swine.
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概要
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The attenuated HT-/SK strain had been developed for the production of a porcine parvovirus (PPV) live vaccine. A field trial on this strain was carried out to prevent viral stillbirth in swine. In it, 180 gilts were divided into two groups, V and N. Group V of 121 gilts was vaccinated and group N of 59 gilts not vaccinated to serve as a control. All the gilts were inseminated within about 2 months before and after the time of vaccination.<BR>The gilts raised on 15 farms were involved in an epizootic of PPV infection during the experimental period (the involved group). The other gilts raised on 10 farms were free from this infection during the same period (the clean group). On the basis of clinical findings, changes in PPV hemagglutination-inhibiting (HI) antibody titer, and the results of parturition, the live vaccine tentatively prepared was analyzed for safety and efficacy.<BR>In 25 gilts of group V in the clean group, the positive rate of HI antibody (positive when a titer was 1: 10 or higher) was 88.0% one month after inoculation (a.i.) and 90.9% after parturition (a.p.). The mean HI antibody titer (GM) was 1: 32.9 one month a.i. and 1: 56.6 a.p.<BR>In 96 gilts of group V in the involved group, the positive rate of HI antibody was 87.4% one month a.i. and 95.1% a.p. GM was 1.93.9 one month a.i. and 1: 137.2 a.p. Antibody titer changed little even after the epizootic was over. In the gilts of group N, there was a remarkable increase in antibody titer after the epizootic. The positive rate of HI antibody was 78.0% a.p. on account of spontaneous infection, when GM was 1: 513.9.<BR>In the clean group, gilts inoculated with vaccine during pregnancy presented a normal parturition, giving birth to young which were all normal. Therefore, it was possible to confirm the safety of the HT<SUP>-</SUP>/SK strain for pregnant swine. In the involved group, the mean number of normal young of the same litter was 1.5-1.9 larger in the gilts of group V than in those of group N, while the mean number of abnormal young of the same littler was 0.9-1.0 smaller in the former than in the latter. Moreover, the rate of occurrence of abnormalities was 20.6-22.9% lower in the dams of group V than in those of group N. It was also 10.2-11.7% lower in the young born in group V than in those born in group N. In brief, group V gave distinctly better results of parturition than group N. Thus, the HT-/SK strain was confirmed to have an effect of preventing stillbirth in swine.
- 公益社団法人 日本獣医師会の論文
公益社団法人 日本獣医師会 | 論文
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