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首页> 外文会议>Workshop on Control of Newcastle Disease and Duck Plague in Village Poultry >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：针对新城疾病病毒的抗体水平在越南农村的鸡

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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：越南普敦·蒂安明省Phu Vang区的2个公社进行了对新城疫病毒抗体患病率的血清学调查。该地区的村民们将鸡保持在扫除或封闭的后院系统下。每个村庄的每个公社和家庭都被随机选择。每个村庄约有30％的家庭群都被取样，10％，鸡鸡和后院鸡20％。每个清除羊群的一只或2只鸟类从每个后院羊群中的1-6只鸟类被取样。记录了鸡鸡的大致年龄和羊群的疫苗状态。从干燥季节的400只鸡中收集血液样品，在雨季再次400次，并且血清被检测血液凝集抑制（HI）抗体对新城疫病毒的抗体。在鸡的年龄和品种之间进行了比较，养殖系统，季节和疫苗接种状态。在一些羊群中使用了基于La Sota的疫苗。总体而言，与Unvac-Cined鸟类相比，疫苗接种鸟类的显着比例具有保护抗体滴度（≥3log_2），疫苗的鸟类的平均滴度显着高。鲸鱼季节没有显着的差异，具有保护性滴度的百叶小失症。与<6-Monlh年龄组相比，≥6-蒙六年龄组的疫苗接种和未接种疫苗的鸟类的Percenlage显着高。与后院鸟类和异国情调的品种相比，在未被寄养的鸟类中，显着更高比例的清除鸟类和当地品种的鸟类患者具有防护液体。威尔林疫苗的鸟类，Phu Thuong公社的防护液的患病率明显高于Phu Mau Commune。讨论了这些差异的可能原因。

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