2016年江苏省部分猪场猪伪狂犬病血清流行病学调查

2011年底,我国再次暴发猪伪狂犬病疫情,并造成严重经济损失。本研究采集2016年江苏省13个地市56个规模猪场的1 741份猪血清,采用伪狂犬病病毒（PRV）gE-ELISA、gB-ELISA抗体检测试剂盒进行血清学流行病学调查。调查结果显示：猪场PRV野毒抗体阳性率为94.6%（53/56）,血清gE抗体阳性率为43.2%,其中苏北地区显著高于苏中和苏南地区;公猪野毒感染阳性率为55%,后备母猪野毒感染阳性率高达69.4%;经产母猪野毒感染阳性率为44%,gE抗体阳性率与母猪胎次密切相关。结果表明：猪伪狂犬病在江苏省流行依然广泛,野毒感染较为严重,尤其是苏北地区;应重点关注种猪群,并加强伪狂犬病的疫苗免疫和抗体检测,从而更好地防控该病。     

2017年华东六省猪伪狂犬病感染抗体检测

为了解华东六省猪伪狂犬病病毒（PRV）感染情况,对2017年华东地区6个省份310家猪场送检的10 179份猪血清样品,应用PRV gE-ELISA抗体检测试剂盒进行感染抗体检测。结果显示：248 家猪场被检出PRV gE阳性抗体,场群阳性率为80.00%（248/310）;4 546份血清样本被检出PRV gE抗体阳性,样本阳性率为44.66%（4 546/10 179）。对不同季节和不同饲养阶段样品的PRV gE抗体阳性率进行统计发现：春季样品阳性率最高,冬季偏低;种母猪样本阳性率最高,为60.59%,其次是经产母猪,种公猪最低。结果表明,华东六省猪群PRV野毒感染较为严重,尤其是母猪群。因此,这些省份应加大猪伪狂犬病的综合防控力度,重点关注种母猪群。     

北京市部分规模化猪场伪狂犬病和猪瘟的血清学调查

为掌握现有防疫体系下北京市的猪伪狂犬病和猪瘟的感染和免疫情况,采用HerdChek PRV gI、gB和CSFV Ag、Ab-ELISA检测试剂盒,对2009年10月送检的北京市10个规模化猪场的300份血清样品进行伪狂犬病和猪瘟的抗原和抗体检测.结果显示,有6个猪场为PRV野毒阴性或野毒感染率较低(<10%),其中有4个场的PRV gB免疫抗体合格率在85%以上;所有这10个猪场均为猪瘟野毒阴性或野毒感染率较低(≤10%),母猪群猪瘟抗体的平均阳性率和平均合格率皆在85%以上.结果显示了这些猪场的母猪群具有较低的猪伪狂犬病毒和猪瘟野毒感染水平,而且具有很整齐的猪瘟抗体水平.     

2012年—2013年我国集约化猪场猪伪狂犬病病毒感染情况的调查

为研究全国范围内中大型猪场猪伪狂犬病病毒(PRV)感染情况,在2012年—2013年,应用PCR方法及gE-ELISA试剂盒对采集自17个省126个集团或猪场的164份病料、2 212份血清进行猪伪狂犬病(PR)病原及血清野毒gE抗体的检测。结果表明,病料样品中,PRV野毒阳性率为34.1%,PRV野毒阳性猪场占检测猪场总数的38.6%;血清样品中,PRV野毒抗体阳性猪场48个,猪场阳性率为38.1%,总样品阳性率为14.96%;2013年的感染率比2012年的高,且冬、夏两季PRV野毒阳性率较高;保育猪的PRV野毒阳性率最高,为22.34%,种母猪群PRV野毒阳性率为14.32%;华东地区PRV阳性比例最高,南方地区的PRV野毒阳性率高于北方地区。通过本次调查,说明PRV在我国的猪场依然普遍存在,对猪场进行PR的控制和净化是非常必要的。     

2013-2018年福建省部分规模化猪场猪伪狂犬病病毒野毒感染的流行病学调查

为了解2013-2018年福建省西南地区规模化猪场猪群伪狂犬病病毒(PRV)野毒感染情况,本研究分别采用PCR和ELISA检测方法,对2013-2018年该地区787个规模化猪场送检的1320份疑似发病猪群组织样品、3041场次的猪场67660份猪血清样品进行PRV病原学、血清学检测。结果显示:送检病例猪组织样品PRV野毒感染总阳性率为50.83%,场阳性率为52.60%;送检猪血清样品野毒感染抗体总阳性率为29.25%,场阳性率为61.13%。对检测数据进行分类统计,分析不同年份和不同猪群送检病例组织样品PRV野毒感染情况,发现2014年和2015年是福建省西南地区规模化猪场不同猪群猪伪狂犬病病毒野毒感染最严重时期;分析不同年份和不同猪群血清样品PRV野毒感染gE抗体,发现2015-2018年PRV野毒感染的猪场阳性率处于较高水平。不同猪群的猪存在一定比例的PRV-gE抗体阳性猪,但差别不明显。结果表明,福建省西南地区猪伪狂犬变异毒株流行后,规模化猪场猪伪狂犬病野毒防控形势更加严峻,提示应进一步加强伪狂犬病疫苗免疫的预防控制水平,并定期做好病原学、血清学监测,实时调整疫苗免疫程序,减少其他疫病的混合感染导致的猪场疫病控制更加复杂化。     

2015—2020年山东省枣庄地区部分养殖场户猪伪狂犬病流行病学调查

为了解山东省枣庄地区猪伪狂犬病野毒感染情况,2015—2020年对该地区的83家规模猪场和92家散养户采集3 634份猪血清样品,采用ELISA方法进行了猪伪狂犬病野毒感染gE抗体检测。结果显示,175家养殖场户中有73家群体显示猪伪狂犬病野毒感染阳性,群体阳性率为41.71%。3 634份血清样品中有905份样品猪伪狂犬病野毒gE抗体阳性,个体阳性率为24.90%;并对不同养殖类型、不同区域、不同年份的猪伪狂犬病野毒感染情况进行分析。结果表明,枣庄地区的部分养殖场户的猪场中存在猪伪狂犬病野毒毒株,该地区的养殖场（户）应加强对猪伪狂犬病疫苗免疫和生物安全综合防控。     

福建省部分地区规模化猪场伪狂犬病感染情况调查

为掌握现有防疫体系下福建省部分地区规模化猪场猪伪狂犬病野毒感染情况,采用HerdChek PRV gE—ELISA检测试剂盒对2009年10月送检的8个市40个规模化猪场1214份血清样品进行伪狂犬病野毒抗体检测。结果显示,伪狂犬病野毒抗体阳性猪场有25个,占检测猪场总数的62．5％;各猪场血清样品中伪狂犬病野毒抗体平均阳性率为23．56％;不同地区规模化猪场母猪群的伪狂犬病野毒抗体平均阳性率为22．46％,其中阳性率最高为55．83％;不同胎次母猪群的伪狂犬病野毒抗体阳性率差异不显著。本次调查结果表明,福建省不同地区规模化猪场均存在不同程度的伪狂犬病野毒感染,其中以莆田和南平地区较为严重。     

2014年上海部分规模猪场母猪伪狂犬病感染情况调查

[目的]了解和评估上海市部分规模猪场母猪群伪狂犬病野毒感染状况。[方法]通过简单随机抽样方法,对上海市35个规模猪场的2097份母猪血清样品,应用gpI-ELISA方法进行猪伪狂犬病野毒感染抗体检测。[结果]2014年上海市部分规模猪场母猪群伪狂犬病猪群感染抗体阳性率为56%（95%置信区间43.46%~68.55%）,从2010年至2014年野毒感染抗体呈逐年上升趋势,但大型规模猪场（母猪存栏量>1000头）伪狂犬病的防控成效较为显著。[结论]上海地区部分规模猪场猪群中伪狂犬病流行率较高,通过执行科学的免疫程序,构筑良好的生物安全环境对猪伪狂犬病将起到良好防控效果。     

2012～2017年我国部分地区规模化猪场PRV野毒流行病学调查

为了监测我国规模化猪场伪狂犬病病毒(Pseudorabies virus,PRV)野毒感染情况,本研究采用伪狂犬g E抗体ELISA检测试剂盒对2012年2月~2017年7月送检的我国11个省份925个规模化猪场的44809份猪血清样品进行PRV野毒抗体检测。结果显示,925个猪场中有508个野毒阳性猪场,占检测猪场总数的54.91%,检出9153份阳性猪血清,平均阳性率为20.42%。其中种猪的野毒感染情况最明显,检出率较高,阳性率为23.19%;育肥猪的阳性检出率最低为17.22%。调查表明,我国规模化猪场猪群中仍存在PRV野毒感染。同时,本调查分析了不同地区、不同日龄猪的PRV野毒感染情况及该病的流行趋势,为我国伪狂犬病的净化提供思路。     

2015—2020年山东省枣庄地区部分养殖场户猪伪狂犬病流行病学调查

为了解山东省枣庄地区猪伪犬病野毒感染情况,2015—2020年对该地区的83家规模猪场和92家散养户采集3634份猪血清样品,采用ELISA方法进行了猪伪狂犬病野毒感染gE抗体检测。结果显示,175家养殖场户中有73家群体显示猪伪狂犬病野毒感染阳性,群体阳性率为41.71%。3634份血清样品中有905份样品猪伪狂犬病野毒gE抗体阳性,个体阳性率为24.90%;并对不同养殖类型、不同区域、不同年份的猪伪狂犬病野毒感染情况进行分析。结果表明,枣庄地区的部分养殖场户的猪场中存在猪伪狂犬病野毒毒株,该地区的养殖场(户)应加强对猪伪狂犬病疫苗免疫和生物安全综合防控。     

Heartworm in dogs in Canada in 1984

In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal.

Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection.

     

Heartworm in dogs in Canada in 1985

In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%).

Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada.

     

Heartworm in dogs in Canada in 1988

In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%).     

Heartworm in dogs in Canada in 1989

In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated.

Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively.

     

Heartworm in dogs in Canada in 1987

In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%).     

Heartworm in dogs in Canada in 1986

In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%).

Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada.

     

Heartworm in dogs in Canada in 1991

In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium.     

Heartworm in dogs in Canada in 1983

In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario.

Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously.