陕西省部分猪场5种疫病抗体及病原的检测

为调查2019年陕西省规模化猪场中口蹄疫(FMD)、猪繁殖与呼吸综合征(PRRS)、猪瘟(CSF)、猪圆环病毒2型(PCV2)和猪伪狂犬病(PR)的免疫状况及病原感染情况,采用间接ELISA对送检的20 233份血清样品进行抗体检测,采用PCR/RT-PCR方法对送检的1 633份病料样品进行病原检测。结果表明,检测口蹄疫抗体的5 154份血清样品中(4 089份免疫血清,1 065份未免疫血清),免疫抗体阳性率为76.69%,感染率为42.25%;检测猪繁殖与呼吸综合征抗体的6 259份血清样品中(5 516份免疫血清,743份未免疫血清),免疫抗体阳性率为85.06%,感染率为28.26%;检测猪瘟抗体的5 165份血清样品中(4 881份免疫血清,284份未免疫血清),免疫抗体阳性率为88.10%,感染率为47.89%;检测伪狂犬病病毒gB抗体的3 142份血清样品中(2 810份免疫血清,332份未免疫血清),免疫抗体阳性率为84.23%,感染率为21.69%;检测猪圆环病毒2型抗体的513份血清样品中(420份免疫血清,93份未免疫血清),免疫抗体阳性率为95%,感染率为88.17%。检测猪瘟病毒的328份病料中,阳性率为9.45%;检测猪圆环病毒2型的218份病料中,阳性率为14.23%;检测猪繁殖与呼吸综合征病毒的654份病料中,阳性率为10.86%;检测伪狂犬病病毒的144份病料中,阳性率为2.78%;检测口蹄疫病毒的226份病料中,阳性率为0.44%。通过对5种常见病原和抗体的检测,为陕西省猪场常见疫病的防控提供了基础资料。     

清远市部分规模化猪场四种疫病的抗体检测与分析

为评价清远市部分规模化猪场猪瘟(CSF)、猪繁殖与呼吸综合征(PRRS)、猪圆环病毒病(PCVD)和猪伪狂犬病(PR)疫苗免疫水平,从7家规模化猪场采集了322份血清样品,采用酶联免疫吸附试验(ELISA)方法检测了猪瘟、猪繁殖与呼吸综合征、猪圆环病毒病和猪伪狂犬病病毒gB抗体和gE抗体。结果表明:猪瘟、猪繁殖与呼吸综合征、猪圆环病毒病和猪伪狂犬病病毒gB抗体阳性率分别为93.48%、89.13%、90.37%、92.24%,离散度分别为22.69%、56.61%、36.13%、31.12%。说明这7家猪场四种疫病疫苗免疫效果良好,其中有1家猪场怀疑伪狂犬野毒流行。     

5省区规模猪场猪呼吸道病综合征病原学调查的统计分析

对5省区规模猪场猪呼吸道病综合征(PRDC)的2 184份血清检测结果进行分析、归纳,结果显示,其主要病原是猪繁殖与呼吸综合征病毒、圆环病毒2型和伪狂犬病病毒,其中猪繁殖与呼吸综合征病毒阳性率为34.80%,圆环病毒2型阳性率为58.24%,伪狂犬病病毒阳性率为27.79%,而猪瘟病毒和猪流感病毒的感染率较低;上海市病料的主要病因是肺炎支原体(57.50%)和猪繁殖与呼吸综合征病毒(45.83%),海南省血清的主导病原是圆环病毒2型(90.5%)、胸膜肺炎放线杆菌(72.7%),说明肺炎支原体和胸膜肺炎放线杆菌的感染可能有一定的地域性;PRDC的混合感染率较高(广西43.77%,云南35.75%)。     

云南地区部分猪场猪呼吸道疾病综合征致病病毒感染的流行病学调查

为了解云南地区猪场猪呼吸道疾病的流行病学,从而为有效防制该疾病提供科学依据,利用ELISA和RT-PCR方法检测了春、夏、秋、冬四季,云南地区不同区域规模养殖场1 164份血清和全血样品中的猪瘟抗原、猪繁殖与呼吸综合征抗原、猪伪狂犬gE抗体、猪圆环病毒2型特异抗体。结果显示:猪瘟抗原阳性率为11.34%,猪圆环病毒2型抗体阳性率为50.86%,猪伪狂犬病病毒gE抗体阳性率为35.40%,猪繁殖与呼吸综合征抗原阳性率为44.51%。表明云南地区规模化猪场存在猪瘟病毒、猪圆环病毒2型、猪伪狂犬病野毒、猪繁殖与呼吸综合征病毒感染,不同季节和猪群年龄阶段感染情况有一定差异性。     

河南省四种猪病的血清学监测与分析

河南农业大学牧医工程学院疫病检测中心实验室从河南省88个规模化猪场采取血清样品1095份,采用5套试剂盒检测了猪瘟(HC)、猪繁殖与呼吸障碍综合征(PRRS)、伪狂犬病(PR)、猪Ⅱ型圆环病毒病(PCV-Ⅱ)4种引起猪繁殖障碍综合征的传染病。其中对24个场进行猪瘟抗原检测,并对包括这24个场在内的64个猪场病例的血清样品618份进行猪瘟、猪繁殖与呼吸障碍综合征、伪狂犬病及圆环病毒病的抗体检测。结果表明,猪瘟抗原检出率是27.8%,抗体检测阳性保护率达81.3%;使用猪繁殖与呼吸障碍综合征疫苗的猪场血清阳性率是85.7%,未使用此疫苗的猪场,阳性率高达69.5%;使用伪狂犬病毒基因缺失苗的猪场抗体阳性率33.8%;圆环病毒抗体阳性率高达73.5%。同时HC、PRRS、PR及PCV-Ⅱ的混合感染也较严重,阳性率分别为18.1%、35.7%、44.7%、78.5%,圆环病毒的阳性率最高。     

重庆某种猪场猪瘟、口蹄疫、伪狂犬病、猪繁殖与呼吸综合征抗体的ELISA检测

利用ELISA方法,对重庆市渝北区某种猪场种公猪、保育猪、育成猪、后备种猪、基础母猪不同类型和生长阶段猪群的猪瘟病毒抗体、O型口蹄疫抗体、口蹄疫病毒非结构蛋白抗体、伪狂犬病抗体、猪伪狂犬病病毒gpI抗体、猪繁殖与呼吸综合征病毒抗体进行了监测和分析,结果表明:猪瘟、口蹄疫、猪伪狂犬病免疫总体水平较高,在上半年和下半年的抗体检测合格率均达到100%;猪繁殖与呼吸综合征病毒在上半年和下半年的抗体平均阳性率分别为9.8%和62%,抗体阳性率分别在95%～100%和40%～80%,由于该种猪场未曾免疫猪繁殖与呼吸综会征疫苗,表明猪繁殖与呼吸综合征病毒的感染程度较高,且在不同猪群普遍存在,应予以充分重视。     

广西田东县部分猪场四种疫病病原及三种疫病血清学的检测与分析

为了解广西田东县部分猪场猪瘟?高致病性猪繁殖与呼吸综合征(猪蓝耳病)、猪圆环病毒2型和猪伪狂犬病的流行情况，采用RT-PCR方法及PCR方法检测组织样品，对各猪场送检的162份组织样品进行猪瘟病毒(CSFV) 高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)、猪圆环病毒2型(PCV-2)和猪伪狂犬病病毒(PRV)核酸检测。采用ELISA方法对送检临床健康猪群400份血清样品进行CSFV、HP-PRRSV、PRV-gE抗体检测。病原检测结果显示：病料CSFV核酸检测为阴性；HP-PRRSV、PCV2、PRV核酸总阳性率分别：6.79%、40.74%、1.23%;对不同猪群各种病原核酸阳性率分析发现，育肥猪HP-PRRSV阳性率最高，为11.53%,保育猪PCV2阳性率最高，为51.9%,种母猪PRV阳性率最高，为6.45%。抗体检测结果显示：CSFV抗体阳性率为87%,HP-PRRSV抗体阳性率77.5%,PRV-gE抗体阳生率为12.25%。本研究表明，CSFV免疫效果好，并有效地控制了该病在本区域的发生与流行。HP-PRRS、PCV2、PR这3种疫病仍在猪群中散发流行，需要加强防控...     

云南省部分地区种公猪精液携带繁殖障碍性病毒调查研究

为了解云南省部分地区规模化猪场种公猪精液繁殖障碍病毒性病原的感染状况,应用PCR对2014年—2016年间云南省部分地区规模化猪场212份种公猪精液进行了猪繁殖与呼吸综合征病毒(PRRSV)、猪瘟病毒(CSFV)、猪伪狂犬病病毒(PRV)、猪圆环病毒2型(PCV2)和猪细小病毒(PPV)5种与猪繁殖障碍有关的病原检测。结果表明,PPRSV阳性率为7.08%,CSFV阳性率为3.77%,PCV2阳性率为6.60%,PRV阳性率为3.30%,没有检测出PPV,PRRSV和PCV2的感染率呈上升趋势,其他疫病保持相对平稳态势。所有的混合感染样品中,均检测出了PRRSV,其中PRRSV和PCV2的混合感染最为常见。结果提示,控制猪场疫病发生的关键是控制PRRSV和PCV2的流行,有必要加强对种猪群的疫病病毒检测,推行种猪场主要疫病的控制与净化工作。     

2011～2014年上海市屠宰场上市肉猪主要病毒感染情况调查

为了解上海市屠宰场上市肉猪主要病毒的感染情况,2011~2014年在上海市5个屠宰场共采集759份血清样品,采用ELISA方法进行了口蹄疫、猪瘟、猪繁殖与呼吸综合征抗体检测;采用荧光PCR方法对720份组织样品进行了口蹄疫病毒、猪繁殖与呼吸综合征病毒、猪瘟病毒、伪狂犬病毒、猪圆环病毒2型、猪流感病毒、猪细小病毒7种病毒检测。血清学检测结果显示,猪繁殖与呼吸综合征、猪瘟、口蹄疫抗体平均阳性率依次为96.6%、72.3%、66.4%。荧光PCR检测结果:口蹄疫病毒、猪瘟病毒、猪繁殖与呼吸综合征病毒、伪狂犬病毒均为阴性,但猪圆环病毒2型、猪细小病毒阳性率较高,阳性率分别是37.9%、8.3%。由此可见,上海市屠宰场上市肉猪重大动物疫病防控已有一定效果,但猪圆环病毒2型和猪细小病毒仍具有较高阳性率,对猪群健康存在一定的危害。     

湖南省部分原种猪场主要繁殖障碍性疫病的调查

为了解湖南省原种猪场主要繁殖障碍性病原感染情况及免疫抗体水平。从2011年开始,对我省部分原种猪场进行采样;每年监测5个原种猪场,连续4年,共采血清样品900份、扁桃体样本888份。样品进行了猪瘟病毒(CSFV)、猪繁殖与呼吸综合征病毒(PRRSV)、高致病性猪繁殖与呼吸综合征病毒(HP-PRRSV)、伪狂犬病病毒(PRV)、猪圆环病毒2型(PCV-2)、猪细小病毒(PPV)病原检测。结果显示,CSFV、PRRSV、HPPRRSV、PRV、PCV-2和PPV在我湖南原种猪场存在不同程度的感染,病原阳性率分别为0.12%、2.78%、0.45%、5.33%、9.02%和13.5%。血清样品进行了CSFV、PRRSV、PRV(gB)、PCV-2抗体检测,合格率分别为84.9%、90.6%、93.3%合100%。各猪场根据自身情况,加大监测力度,适时开展动物疫病净化工作,并采取严格的生物安全措施,从源头控制疫病的发生。     

Retrospective analysis of etiologic agents associated with respiratory diseases in pigs

Twenty-eight hundred and seventy-two cases of respiratory disease in pigs were analyzed for their etiologic agents. Two or more pathogens were detected from 88.2% of the cases, indicating that porcine reproductive and respiratory syndrome virus (PRRSV) or swine influenza virus (SIV) combined with other bacterial agents was a common cause for porcine respiratory diseases in the mid-western USA.     

野猪病原体混合感染的PCR诊断与防控

野猪集约饲养是目前新发展起来的养殖产业之一,野猪抗病力强,发生猪瘟、猪繁殖与呼吸综合征等烈性传染病病例的报道较少。2009年8月,山西寿阳某野猪场出现高发病、高死亡病例,应用PCR技术进行了病原检测,结果为野仔猪混合感染猪肺炎支原体、猪繁殖与呼吸综合征、猪瘟。证明野猪对以上疫病具有易感性,并提出一些防制办法,对野猪饲养建立合理的免疫程序具有一定的参考价值。     

广西德保县黑猪主要疫病病原学和血清学检测

为了解德保黑猪主要疫病流行状况和免疫效果,2018—2020年采集166个德保黑猪饲养场点的300份病死猪样品进行非洲猪瘟(ASF)、猪瘟(CSF)、口蹄疫(FMD)、猪繁殖与呼吸综合征(PRRS)、猪伪狂犬病(PR)、猪圆环病毒病(PCV-2)、猪支原体病(PPLO)、猪传染性胸膜肺炎(PCP)、猪链球菌病(SS)、猪流行性腹泻(PED)、猪传染性胃肠炎(TGE)等11种主要疫病的病原学检测,2017—2020年采集35个场点的临床健康德保黑猪血清样品840份进行FMD、CSF、PRRS抗体检测。结果显示:PCV-2样品平均阳性检出率为68.3%,PRRS、PR、PED、PPLO、SS等疫病的病原阳性检出率分别为1.7%、1.0%、1.0%、0.3%、0.3%;CSF平均抗体阳性率为95.8%,而FMD、PRRS平均抗体阳性率较低,分别为79.3%、73.2%,且各年份变化较大。结果表明,德保黑猪主要疫病防控效果较好,大部分疫病得到有效控制,但PCV-2感染仍较严重,这是导致德保黑猪发病死亡以及FMD、PRRS免疫效果不佳的主要因素之一,需要重点加强控制。     

我国猪繁殖与呼吸综合征研究进展

猪繁殖与呼吸综合征是一种主要以母猪繁殖障碍和仔猪呼吸困难为特征的免疫抑制性传染病。自1996年在中国被证实传入现已在全国各地流行,给养猪业造成了巨大经济损失。本文就PRRS的危害、流行病学和疫苗研究展开综述,旨在为广大养猪户预防和控制该病提供理论指导。     

猪繁殖与呼吸综合征防控方法研究进展

猪繁殖与呼吸综合征(PRRS)是危害养猪业的一种高度传染性疾病,在临床上以母猪流产、死胎等繁殖障碍以及仔猪呼吸道症状和高死亡率为特征,给养猪业造成了严重的经济损失.目前,PRRS的诊断与综合防治技术已成为国内外兽医学家研究的热点.论文简要概述了近几年来我国对PRRS病原学、临床症状、诊断学及其防控等方面的研究进展,并对当前存在的问题进行了讨论.     

Interleukin-12 (IL-12) ameliorates the effects of porcine respiratory and reproductive syndrome virus (PRRSV) infection

Porcine respiratory and reproductive syndrome virus (PRRSV) disease, one of the most economically significant viral diseases in the swine industry, is characterized by miscarriages, premature farrowing, stillborn pigs, and respiratory disease associated with death and chronic poor performance of nursing and weaned pigs. Interleukin-12 (IL-12) is a key component in driving the development of cell-mediated immunity as well as stimulating interferon-gamma (IFN-gamma) production from T cells and natural killer cells. Although some studies have investigated the use of IL-12 as a vaccine adjuvant in swine, little is known about its effectiveness as a treatment against viral diseases in swine. The present study investigated whether recombinant porcine IL-12 (rpIL-12) enhances the immune response and thereby diminishes the effects of PRRSV infection in young pigs. Interestingly, in vitro experiments demonstrated that rpIL-12 is capable of inducing swine pulmonary alveolar macrophages (PAMs), the target cells of PRRSV, to produce IFN-gamma in a dose and time dependent manner. In addition, in vitro studies also revealed that rpIL-12 treatment was capable of significantly reducing PRRSV viral titers in PAMs. In vivo administration of rpIL-12 significantly decreased PRRSV titers in the lungs and blood of infected animals. Furthermore, treatment with rpIL-12 prevented significant growth retardation in PRRSV-infected animals. Finally, in response to viral antigen recall challenge, PAMs isolated from rpIL-12-treated/PRRSV-infected animals produced greater amounts of IFN-gamma and lesser amounts of interleukin-10 than PAMs isolated from non-rpIL-12-treated/PRRSV-infected animals. Taken together our data indicate that treatment with rpIL-12 may provide an effective approach to control or ameliorate PRRSV-induced disease in swine.     

Lifetime reproductive and financial performance of female swine

OBJECTIVE: To evaluate reproductive and financial performance for commercial swine herds grouped on the basis of pattern of removal of female swine. DESIGN: Cohort study. SAMPLE POPULATION: 25 swine herds. PROCEDURES: Lifetime reproductive productivity was summarized as number of pigs weaned per herd day per mated female and as number of herd days per pig weaned per mated female. Factors associated with these 2 measures were determined by use of linear regression. Financial data from a commercial database were used to estimate maximum number of parities at removal associated with profitability. Sensitivity analysis was used to simulate how variations in daily maintenance cost and value per weaned pig would influence profitability. RESULTS: Mean number of pigs weaned per herd day per mated female was 0.054; mean number of herd days per pig weaned per mated female was 20.2. Both these measures were associated with proportion of nonproductive days during herd life, preweaning mortality rate per litter weaned, mean lifetime number of pigs born alive per litter weaned, and mean lifetime lactation duration. Maximum parity at time of removal associated with profitability ranged from 5 to 8. Daily maintenance costs per female had a greater impact on lifetime profitability than did value per weaned pig. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that lifetime reproductive and financial performance is optimized among swine herds that have higher proportions of high-parity females.     

哈尔滨地区猪旋毛虫对猪,犬的感染性试验

用消化法所得的猪旋毛虫蚴分别接种猪，犬。结果表明，猪旋毛虫对猪，犬的感染性存在着明显差异，在猪的繁殖力指数为１１７．０４，而在犬为３０．６０，说明哈尔滨地区猪旋毛虫档地旋毛形线虫；     

猪日本乙型脑炎检测技术研究进展

猪日本乙型脑炎是由黄病毒科乙型脑炎病毒引起的一种人畜共患的病毒性传染病。人与多种动物均能感染,其中猪是主要的储存宿主和扩散宿主,猪感染该病毒后引发猪的繁殖障碍,使养猪业遭受重大经济损失,因此学者们一直在致力于寻找可以快速检测和诊断日本乙型脑炎的方法,为预防和治疗该病提供基础条件。文章对猪日本乙型脑炎检测技术,包括病毒分离鉴定方法、血清学方法、分子生物学方法等方面的研究进展进行了较为全面的综述。     

Occurrence of Salmonella serotype Typhimurium DT104 on a commercial swine farm before, during, and after depopulation and repopulation

OBJECTIVE: To determine whether depopulation-repopulation could be used to eradicate Salmonella serotype Typhimurium DT104 from a commercial swine farm in the midwestern United States. DESIGN: Observational study SAMPLE POPULATION: A commercial swine farm undergoing depopulation-repopulation to eliminate porcine reproductive and respiratory syndrome virus and Mycoplasma hyopneumoniae. PROCEDURE: Pooled fecal samples, tissue samples, and serum samples were collected from pigs on the farm before and after depopulation-repopulation. When there were no pigs on the farm, environmental swab specimens were collected for bacterial culture. Serum was analyzed for anti-Salmonella antibodies with an indirect ELISA. Salmonella isolates obtained by bacterial culture of fecal, tissue, and environmental samples were characterized by means of serotyping, phage typing, pulsed-field gel electrophoresis (PFGE), and antimicrobial susceptibility testing. RESULTS: 167 Salmonella isolates representing 9 serotypes were recovered from the farm. Results of PFGE and antimicrobial susceptibility testing suggested that S. Typhimurium DT104 strain was not eradicated from the farm. However, seroprevalence of anti-Salmonella antibodies and the percentage of pooled fecal samples positive for Salmonella spp were significantly decreased following repopulation. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggested that depopulation-repopulation in conjunction with stringent cleaning and disinfection, attention to biosecurity procedures, control of other diseases, and changes in feed management may reduce the occurrence of, but likely will not eliminate, Salmonella spp in commercial swine herds.