吉林地区规模化猪场猪繁殖与呼吸综合征的血清学检测

本试验应用ELISA法对吉林地区8个猪繁殖与呼吸综合征(PRRS)未免疫猪场和9个PRRS免疫猪场的后备母猪、生产母猪和5~10周龄的断奶仔猪3个猪群进行了猪繁殖与呼吸综合征病毒(PRRSV)抗体检测,结果表明:吉林地区8个PRRS未免疫猪场均受有PRRSV感染,猪场抗体阳性率为100%,猪群抗体阳性率在50%~75%之间,平均阳性率为62.26%;吉林地区9个PRRS免疫猪场猪群PRRSV抗体阳性率在70%~100.00%之间,平均阳性率为87.78%。PRRS未免疫猪场与PRRS免疫猪场猪群抗体平均阳性率相比,差异极显著(P<0.01)。     

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）。     

贵阳市规模化猪场猪繁殖与呼吸综合征血清学调查研究

试验应用ELISA检测方法对贵阳市3个未免疫猪繁殖与呼吸综合征（PRRS）猪场和9个免疫猪场的后备母猪、生产母猪和5～10周龄断奶仔猪3个猪群进行猪繁殖与呼吸综合征病毒（PRRSV）抗体检测。结果表明：贵阳市3个未免疫猪场中2个有PRRSV感染,猪群抗体阳性率在0％-10％之间,平均阳性率为5％;9个免疫猪场猪群PRRSV抗体阳性率在65％～90％之间,平均阳性率为82．80％,未免疫猪场与免疫猪场猪群抗体平均阳性率相比,差异极显著（P〈0．01）。     

安徽省部分规模化猪场猪繁殖与呼吸综合征血清学调查

在安徽部分地区采集了14个猪繁殖与呼吸综合征(PRRS)免疫猪场和13个非PRRS免疫猪场不同猪群血清样品743份,应用ELISA方法检测PRRSV抗体.结果显示,未免疫猪场PRRSV抗体平均阳性率为31.17%,猪场阳性率为76.92%;免疫PRRS猪场抗体平均阳性率为62.99%.通过SPSS3.0软件数据分析表明,PRRS免疫猪场与未免疫猪场PRRS抗体阳性率差异极显著(P<0.01),提示安徽省规模猪场存在PRRSV隐性感染.     

豫南地区规模化猪场猪繁殖与呼吸综合征病毒和猪圆环病毒2型抗体检测与分析

为掌握豫南地区规模化猪场中猪繁殖与呼吸综合征病毒（PRRSV）和猪圆环病毒2型（PCV2）疫苗免疫场猪群抗体水平和非疫苗免疫场猪群病原感染情况,试验利用ELISA方法对该地区猪群进行了PRRSV和PCV2抗体水平检测。结果表明,在疫苗免疫猪群中,PRRSV和PCV2抗体合格率分别为68.8%和58.7%,规模越大的猪场合格率越高,200~500头母猪规模场抗体阳性率最高（分别为76.8%和77.4%）,50头母猪以下场最低（分别为48.3%和44.2%）,种猪的合格率均最高,而育肥猪群合格率均最低。在非疫苗免疫猪群中,PRRSV和PCV2抗体阳性率分别为55.6%和65.3%,PRRSV抗体阳性率最低的是100~200头母猪规模场（46.5%）,最高的是50头母猪以下规模场（68.8%）,断奶仔猪和育肥猪群抗体阳性率均在71%以上;随猪场规模越大,PCV2抗体阳性率越低,200~500头母猪规模场抗体阳性率为41.4%,50~100头规模场和50头以下场的阳性率分别为78.9%和78.6%,种公、母猪的PCV2抗体阳性率最低（分别为37.5%和40.4%）,断奶仔猪和育肥猪抗体阳性率较高（分别为82.2%和79.5%）。本研究反映了豫南地区猪繁殖与呼吸综合征（porcine reproductive and respiratory syndrome,PRRS）和猪圆环病毒病（porcine circovirus disease,PCVD）疫苗免疫猪场的疫苗免疫效果和非疫苗免疫猪场病原感染的实际情况和规律,为该地区PRRS和PCVD防制工作提供了理论依据和指导。     

2016～2018年江苏省规模猪场PRRS血清学调查

为了解2016年1月~2018年12月期间江苏省规模猪场猪繁殖与呼吸障碍综合征(porcine reproductive and respiratory syndrome,PRRS)流行动态,本研究对该省27家规模猪场不同批次送检的2062份未免疫PRRS疫苗血清样本,采用ELISA方法进行了猪繁殖与呼吸障碍综合征病毒(Porcine reproductive and respiratory syndrome virus,PRRSV)抗体检测,并对抗体阳性率≥80%的猪群阶段,依据PRRSV抗体S/P分布频段选取135份血清,采用RT-qPCR方法检测并统计PRRSV阳性率,进行血清学调查。结果显示,27家未免疫PRRS疫苗猪场抗体总阳性率为68.82%。不同地区抗体阳性率较高的为宿迁和南通,分别为72.04%和71.09%,连云港地区最低为58.82%。2016~2018年呈现逐年下降的趋势,从76.41%下降至57.72%。不同猪群阶段中以公猪、后备母猪、12~16周龄育肥猪和18~25周龄育肥猪抗体阳性率较高,分别为80.95%、92.86%、86.84%和98.09%。在上述4个抗体阳性率≥80%的猪群阶段,RT-qPCR检测结果显示,24份PRRSV阳性血清样本C t值与抗体S/P值高低无相关性。血清中PRRSV阳性率以后备母猪最高为20.58%,在PRRSV抗体S/P值<0.4和S/P值≥2.5异常分布频段,血清PRRSV阳性率均≥15.38%,而0.4≤S/P值<2.5正常范围内PRRSV阳性率均≤10%,差异显著,具有统计学意义(P<0.05)。表明江苏省规模化猪场不同地区、不同规模和不同阶段猪群普遍存在 PRRSV 感染,该研究结果为规模猪场PRRS的防控提供了参考。     

规模化猪场PRRSV抗体水平监测与分析

为掌握江苏泰州周边地区PRRSV在猪群中的感染情况,应用ELISA方法对规模化猪场的445份血清样本进行猪繁殖与呼吸综合症(PRRS)抗体水平检测,结果显示不同阶段的猪群PRRSV抗体水平,其中仔猪PRRSV抗体阳性率最低,为34.1%,育肥猪群PRRSV抗体水平其次,母猪群PRRSV抗体阳性率最高,为63.5%,平均阳性率为48.3%。对10个不同猪场进行PRRSV抗体水平检测,结果显示血清抗体平均阳性率为55.87%,此结果为当地PRRSV的综合防治提供参考依据。     

广东省猪繁殖与呼吸综合征抗体十年检测结果分析

1997-2006年,用ELISA检测方法对广东省猪群PRRS抗体进行跟踪监测.1997-1999年,全省猪场均未开展PRRS疫苗免疫,猪场抗体平均阳性率分别为17.69%、29.09%、38.42%;2000-2005年,全省猪场逐渐使用PRRS疫苗,抗体平均阳性率分别为40.68%、46.47%、54.14%、55.37%、55.72%、73.03%;2006年对57个猪场1747份血清进行检测,其中85.3%的中大规模场已进行PRRS免疫,抗体平均阳性率为79.8%;82.6%的小规模、个体场未进行PRRS免疫,场阳性率为94.74%,抗体平均阳性率为70.29%.10年来的监测结果表明,广东省猪场遭受PRRSV感染日益严重,大部分猪场存在PRRSV感染.随着PRRS危害性的加重,多数中大规模猪场加强了免疫,但部分规模场和绝大部分小规模、个体猪场仍未做好PRRS的免疫工作.因而,加强PRRS的防控,特别是免疫工作,仍是目前我省猪场的一个重要任务.     

江苏省淮安市猪乙型脑炎血清学调查

为了解淮安市猪场乙型脑炎病毒感染情况,2012年5月笔者应用ELISA试验对全市12个规模猪场共246份血清样品进行集中监测,结果显示经免疫的母猪,血清阳性率平均为70.59%,其中免疫较好的种猪场抗体阳性率100%;未免疫的猪群,其血清阳性率平均为21.83%;免疫猪群与未免疫猪群相比,血清阳性率平均值差异极显著(P<0.01)。未免疫猪群之间抗体阳性率参差不齐,由最低为0到最高的100%不等。说明各猪场由于种猪来源不同、饲养环境不同、管理水平不同等原因,导致猪群乙脑感染率不同。     

2020年云南省部分猪场3种猪源病毒抗体检测

为了解云南省猪场猪瘟（CSF）、猪繁殖与呼吸障碍综合征（PRRS）、猪伪狂犬病（PR）的免疫水平,2020年1—8月,采用ELISA方法对不同猪场随机采集的934份血清进行了这3种疫病病原抗体检测。结果显示：猪瘟病毒（CSFV）平均抗体阳性率为86.51%,不同州市抗体阳性率为57.14%~100%,有2个州市不足70%,不同生长阶段抗体阳性率为80.56%~92.05%;猪繁殖与呼吸障碍综合征病毒（PRRSV）平均抗体阳性率为48.61%,不同州市抗体阳性率为24.00%~100%,仅红河州为100%,其余均不足70%,不同生长阶段PRRSV抗体阳性率为38.33%~56.19%;猪伪狂犬病毒（PRV）gB平均抗体阳性率为79.11%,不同州市gB抗体阳性率为43.33%~100%,除红河州外其余均超过70%;仅玉溪市和曲靖市检出PRV gI抗体阳性,阳性率分别为11.11%和10.70%,阳性样品来源于除公猪外的其他各生长阶段猪群。结果表明,云南省猪场CSF和PR的免疫抗体水平较高,而PRRS免疫抗体水平较低,部分地区还存在PR野毒感染风险。结果提示,云南省应整体加强PRRS的免疫防控,部分地区还需加强CSF和PR免疫及综合防控。本研究为云南省猪场CSF、PRRS和PR的免疫及其防控措施制定提供了参考数据。     

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 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 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 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 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.