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首页> 外文会议>ACIAR Proceedings no.117; Workshop on Control of Newcastle Disease and Duck Plague in Village Poultry; 20030818-20; Ho Chi Minh City(VN) >Antibody levels against Newcastle disease virus in chickens in rural Vietnam
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Antibody levels against Newcastle disease virus in chickens in rural Vietnam

机译：越南农村地区鸡中新城疫病毒的抗体水平

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摘要

A serological survey on the prevalence of antibodies to Newcastle disease virus was carried out in 2 communes of Phu Vang District, Thua Thien Hue Province, Central Vietnam. Villagers in the district keep chickens under either scavenging or enclosed backyard systems. Villages in each commune and households in each village were selected randomly. Approximately 30% of household flocks in each village were sampled, 10% with scavenging chickens and 20% with backyard chickens. One or 2 birds from each scavenging flock and 1-6 birds from each backyard flock were sampled. Approximate ages of the chickens and vaccine status of the flocks were recorded. Blood samples were collected from 400 chickens in the dry season and 400 again in the rainy season, and sera were tested for haemagglutination inhibition (HI) antibodies against Newcastle disease virus. Comparisons were made between ages and breed of chickens, system of husbandry, season and vaccination status. A La Sota-based vaccine was used in some flocks. Overall, a significantly higher proportion of vaccinated birds had protective antibody titres (≥ 3 log_2) compared to unvac-cinated birds and the mean titre was significantly higher in vaccinated birds. There was no significant difference belween seasons in the percentage of birds with protective titres. The percenlage of vaccinated and unvaccinated birds with protective litres was significantly higher in the ≥ 6-monlh age group compared to the < 6-monlh age group. Within unvaccinaled birds, a significantly higher proportion of scavenging birds and birds of local breed had protective lilres compared to backyard birds and exotic breeds, respectively. Wilhin vaccinated birds, the prevalence of protective lilres was significantly higher in Phu Thuong Commune compared to the Phu Mau Commune. The possible reasons for these differences are discussed.
机译：在越南中部Thua Thien Hue省的Phu Vang区的2个乡进行了一项针对新城疫病毒抗体的血清学调查。该地区的村民将鸡饲养在清理系统或封闭式后院系统下。每个公社的村庄和每个村庄的住户都是随机选择的。每个村庄中大约有30％的家庭鸡群被采样，有10％的是拾鸡，而有20％的是后院鸡。每个清粪羊群中有1或2只鸟，而后院羊群中则有1-6只鸟。记录鸡的大约年龄和鸡群的疫苗状况。在干燥季节从400只鸡中采集血样，在雨季再次从400只鸡中采集血样，并测试血清中针对新城疫病毒的血凝抑制（HI）抗体。对鸡的年龄和品种，饲养系统，季节和疫苗接种状况进行了比较。在某些鸡群中使用了基于La Sota的疫苗。总体而言，与未接种疫苗的禽类相比，接种疫苗的禽类中具有保护性抗体滴度（≥3 log_2）的比例明显更高，并且接种疫苗的禽类中的平均滴度明显更高。在季节之间，具有保护性滴度的禽类的百分比没有显着差异。 ≥6个月龄组的带保护性升水疫苗的和未接种的鸟类百分率显着高于<6个月龄的组。在未接种疫苗的鸟类中，与后院鸟类和外来鸟类相比，具有清除保护作用的清道夫鸟类和本地品种鸟类的比例要高得多。威灵疫苗接种鸟类后，富通公社的保护性小盲流行率明显高于富蒙公社。讨论了这些差异的可能原因。

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