猪瘟、猪O型口蹄疫和高致病性猪蓝耳病疫苗不同免疫方法试验

为掌握不同厂家生产的猪瘟疫苗、猪O型口蹄疫疫苗和高致病性猪蓝耳病疫苗按说明剂量使用的免疫效果,找出适应当前生产中3种疫苗两两组合和3种同时分点注射的免疫方法,进行了不同方法免疫试验。结果表明,3种疫苗两两组合同时分点肌肉注射,互不干扰;3种疫苗同时分点肌肉注射,互不干扰,且可以促进高致病性猪蓝耳病疫苗的免疫效果,但个别猪会出现体温升高、拒食等反应。     

猪蓝耳病与圆环病毒混合感染的诊断

引用文献公开发表的猪经典蓝耳病毒与高致病性蓝耳病毒、圆环病毒Ⅱ型的基因引物序列,采用PCR方法对四川省遂宁市某猪场暴发的传染病进行实验室诊断,根据流行病学、临诊症状、剖解病变和PCR病原检测,诊断为猪经典蓝耳、高致病性蓝耳与圆环病毒Ⅱ型病毒的混合感染。     

规模化猪场蓝耳病血清学调查

蓝耳病是影响规模化猪场繁殖性能的主要传染性疾病,笔者在江苏省6个年产万头商品猪的规模化猪场猪群中随机采集297头种猪及仔猪血清进行蓝耳病血清学调查,使用IDEXX酶联免疫吸附诊断试剂盒,检测蓝耳病病毒抗体。结果表明,2个未免疫接种老猪场猪群抗体阳性率52%,断奶仔猪群阳性率39.1%;2个免疫接种老猪场猪群抗体阳性率94%,断奶仔猪群阳性率89.8%。而较新猪场的种猪群阳性率28.6%,断奶仔猪群阳性率5%。     

猪繁殖与呼吸综合征病毒对猪免疫力的影响研究进展

猪繁殖与呼吸综合征(Porcine reproductive and respiratory syndrome,PRRS)对全世界养猪业而言是一种致命的病毒性疾病。它是由猪繁殖与呼吸综合征病毒(PRRSV)引起的一种严重的临床疾病,并且保持终身隐性感染的能力。PRRS也使我国养猪业遭受了巨大的损失,近年来尤其是高致病蓝耳病毒的出现,已严重影响我国生猪养殖业的健康发展。对猪繁殖与呼吸综合征的免疫作用机制及防制措施进行了综述,旨在为其今后的防制提供新的思路与方案。     

中药产品甙肽对猪高热病防治效果分析

为找到一种有效防治猪“高热病”的方法,本研究分别检测试验组和对照组猪血常规、血清生化指标、血清中细胞因子含量,以及甙肽产品对于预防和治疗猪高热病效果进行分析;结果表明使用中药产品甙肽后,能够显著提高试验组猪的非特异性免疫力。进一步证明了中药对于预防病毒性疾病可以起到独特效果。     

猪蓝耳病及继发感染试验诊断与综合防制研究

通过PCR、细菌培养鉴定和血涂片镜检对20例以高热为特征的疑似蓝耳病病例进行病原检测诊断,并根据病因提出综合防治措施.发现蓝耳病（PRRS）阳性率100%,圆环病毒病（PCV-2）阳性率40%,伪狂犬（PRV）阳性率40%,非典型性猪瘟（CSFV）阳性率10%,猪流感（SI）及猪传染性胸膜肺炎（APP）均为阴性,附红细胞体阳性率90%,并有少量细菌感染.结果表明我市猪高热病为高致病性蓝耳病,发病猪并分别不同程度地混合或继发感染了其他病原体,病原一般3～5种,病原多样化导致病情复杂化,增加了诊断和治疗难度,所以本病宜采取综合防治.     

PRRSV、CSFV和JEV混合感染的多联PCR诊断

通过对猪繁殖与呼吸综合征病毒、猪瘟病毒、乙型脑炎病毒等的基因序列分析,设计多联PCR诊断方法诊断发病猪场上述病毒的混合感染,发现单病毒感染率在68．79／6～81．5％之间,混合感染率在58．9％～90％之间。采取的防制措施是研制和普遍使用新型疫苗,严防病原体传入,扑杀危险患病猪只,封闭式饲养等综合性措施,获得了较好的效果。     

猪蓝耳病的诊断与防治

蓝耳病（PRRS）是目前对猪场经济影响最大的疾病,本文主要介绍目前高致病性蓝耳病的流行病学、主要,临床症状及诊断方法,并且提出相应的预防和治疗措施。     

Import risk assessment incorporating a dose–response model: Introduction of highly pathogenic porcine reproductive and respiratory syndrome into Australia via illegally imported raw pork

Highly pathogenic porcine reproductive and respiratory syndrome (PRRS) has spread through parts of south-east Asia, posing a risk to Australia. The objective of this study was to assess the probability of infection of a feral or domestic pig in Australia with highly pathogenic PRRS following ingestion of illegally imported raw pork. A conservative scenario was considered in which 500 g of raw pork was imported from the Philippines into Australia without being detected by border security, then discarded from a household and potentially accessed by a pig. Monte Carlo simulation of a two-dimensional, stochastic model was used to estimate the probability of entry and exposure, and the probability of infection was assessed by incorporating a virus-decay and mechanistic dose–response model. Results indicated that the probability of infection of a feral pig after ingestion of raw meat was higher than the probability of infection of a domestic pig. Sensitivity analysis was used to assess the influence of input parameters on model output probability estimates, and extension of the virus-decay and dose–response model was used to explore the impact of different temperatures and time from slaughter to ingestion of the meat, different weights of meat, and the level of viraemia at slaughter on the infectivity of meat. Parameters with the highest influence on the model output were the level of viraemia of a pig prior to slaughter and the probability of access by a feral pig to food-waste discarded on property surrounding a household. Extension of the decay and dose–response model showed that small pieces of meat (10 g) from a highly pathogenic PRRS viraemic pig could contain enough virus to have a high probability of infection of a pig, and that routes to Australia by sea or air from all highly pathogenic PRRS virus endemic countries were of interest dependent on the temperature of the raw meat during transport. This study highlighted the importance of mitigation strategies such as disposal of food-waste from international traffic as quarantine waste, and the need for further research into the probability of access to food-waste on properties by feral pigs.     

平顶山市猪繁殖与呼吸综合征的血清学调查

通过对平顶山市6个县30个规模化猪场猪繁殖与呼吸综合症血清学调查,了解了平顶山市猪繁殖与呼吸综合症血清学流行情况。结果表明,12个未免疫猪场均不同程度受PRRSV感染,猪场抗体阳性率为100％,猪群抗体阳性率在47．4％-73．1％之间,平均阳性率为57．9％;18个免疫猪场PRRS感染率为77．8％,免疫猪场猪群PRRSV抗体阳性率在75％～100％之间,平均为90．9％。所有猪场不同猪群,生产母猪平均S／P值高于仔猪,后备母猪平均S／P值高于生产母猪。免疫PRRS猪场抗体S／P值,明显高于未免疫PRRS猪场猪群的抗体S／P值,差异极显著（P〈0．01）。