北京部分地区猪传染性胸膜肺炎血清学调查

采用间接血凝试验,对北京地区11个区县未用过猪传染性胸膜肺炎疫苗的部分规模化猪场的1 980份血清样品,进行了猪传染性胸膜肺炎感染抗体检测.结果显示,猪传染性胸膜肺炎总阳性率为25.35%,其中断奶仔猪阳性率为17.68%,育肥猪阳性率为33.03%,育肥猪的感染阳性率高于断奶仔猪,19个猪场中有13个为猪传染性胸膜肺炎阳性猪场;猪传染性胸膜肺炎在冬春季节的感染率较高,1月～3月的阳性率高于4月～6月.     

洛阳地区猪弓形虫病血清学调查与分析

利用间接血凝试验,对来自洛阳地区部分规模化猪场的889份血清样品进行了弓形虫抗体检测,以抗体效价≥1∶64为阳性判定标准,结果发现,上述被检样品的总阳性率为16.5%(147/889),母猪、保育仔猪、育肥猪的阳性率分别为25.6%(70/273)、15.4%(28/182)、11.3%(49/434).阳性母猪、保育仔猪和育肥猪抗体效价的几何平均数分别为1∶218.50、1∶90.51、1∶158.20.     

天津部分猪场副猪嗜血杆菌病与猪传染性胸膜肺炎的流行病学调查

为了解天津部分猪场副猪嗜血杆菌病(HPs)和猪传染性胸膜肺炎(PCP)的流行情况,利用间接血凝试验对采自9个规模猪场的178份猪血清样品进行副猪嗜血杆菌抗体检测,对采自8个规模猪场的166份猪血清样品进行猪传染性胸膜肺炎放线杆菌抗体检测。结果表明:副猪嗜血杆菌阳性率为18.54%(33/178),其中断奶仔猪和保育阶段猪阳性率为23.58%(25/106);猪传染性胸膜肺炎的阳性率为21.08%(35/166),其中断奶仔猪阳性率为20.93%(9/43),育肥猪阳性率为27.66%(13/47),种猪阳性率为21.62%(8/37)。说明天津地区部分猪场的副猪嗜血杆菌病和猪传染性胸膜肺炎呈地方性流行。     

四川省部分地区猪传染性胸膜肺炎的流行病学调查

为弄清猪传染性胸膜肺炎在四川省的流行状况,笔者利用猪传染性胸膜肺炎抗体检测正向间接血凝试剂盒对在不同时间采集的、不同地区和不同来源的1062份非免疫猪血清进行了检测。结果不同地区猪群的猪传染性胸膜肺炎抗体阳性率不同,从1%-37%,平均阳性率为18.5%。其中,30日龄以内未断奶仔猪阳性率为1%、30-70日龄保育仔猪阳性率为23%、70-150日龄育肥猪阳性率为27%、后备母猪阳性率为8%、经产母猪阳性率为3%。以上结果表明猪传染性胸膜肺炎在四川省各地都有发生,且发生与猪的日龄、饲养方式有关。     

我国部分地区猪传染性胸膜肺炎放线杆菌的血清型流行病学调查

为了弄清猪传染性胸膜肺炎在我国部分地区猪场的流行情况,对湖北、湖南、四川、广东、山东、福建等省的24个不同规模的未免疫养猪场进行了流行病学调查,共采集1 464份猪血清样品,其中1 187份血清样品通过琼脂扩散试验进行检测,对阳性血清进行分型,277份血清样品使用猪传染性胸膜肺炎ApxⅣ-ELISA抗体检测试剂盒进行检测。检测结果显示,378份血清样品经琼脂扩散试验检测为阳性,阳性率为31.84%(378/1 187);164份血清样品经ELISA试剂盒检测为阳性,阳性率为59.21%(164/277).阳性血清样品分型结果显示,血清型7型、11型、10型、13型、5型和1型样品分别有56、52、48、44、43和40份,阳性率分别为14.81%、13.76%、12.70%、11.64%、11.38%和10.58%。该研究表明,猪传染性胸膜肺炎流行于我国部分地区,血清阳性率较高,其中以血清7型阳性率最高,且血清11型、10型、13型、5型和1型的阳性率都超过10%。     

湖南省部分地区猪传染性胸膜肺炎的流行病学调查

为了解猪传染性胸膜肺炎在湖南省的流行状况,采用正向间接血凝试剂盒对在不同时间、不同地区和不同猪场采集的的267份非免疫猪血清进行了猪传染性胸膜肺炎抗体检测.结果发现,上述被检样品的总阳性率为34.46％,其中母猪阳性率最高为61.67％,30日龄猪阳性率为48.57％、60日龄猪阳性率为7.76％、90日龄猪阳性率为2...     

青海省猪传染性胸膜肺炎的血清学调查

采用猪传染性胸膜肺炎间接血凝(IHA)试验,对来自青海省3个规模化猪场的209份血清,进行了猪传染性胸膜肺炎血清抗体检查。结果,共检出119份阳性血清,阳性率为56.94%,表明青海省部分猪场中存在猪胸膜肺炎放线杆菌的感染。     

猪传染性胸膜肺炎血清学调查

2005年5月10日-6月9日，在阜阳市3县1市进行了猪传染性胸膜肺炎的血清学调查，抗体阳性率达38．62％，现报告如下。1被检血清采集阜阳市临泉、阜南、太和、界首3县1市8个规模养猪场和40个散养户猪血清145份，包括母猪、20～45日龄仔猪（无母源抗体）、育肥猪，均未注射猪胸膜肺炎疫苗。     

赤峰地区猪传染性胸膜肺炎的血清学调查报告

对赤峰地区5个猪场送检的未免疫猪传染性胸膜肺炎疫苗的不同年龄阶段猪的338份血清样品,用间接血凝试验进行胸膜肺炎抗体检测。结果表明,所有猪场抗体均为阳性,平均阳性率63.15%;哺乳仔猪、育仔猪、生长育肥猪和成年种猪抗体阳性率分别达到3.23%、14.08%、91.14%、95.79%,总阳性率为52.07%。     

海南省规模猪场猪传染性胸膜肺炎的血清学调查

为了解海南省规模猪场猪传染性胸膜肺炎(PCP)的感染情况,采集海南省8个市县16个不同规模猪场血清样品1 286份,用ELISA方法对猪胸膜肺炎放线杆菌(APP)ApxⅣ抗体进行检测,分析APP的感染情况。结果显示,1 286份猪血清样品共检出阳性样品436份,抗体阳性率为33.90%。其中,检测母猪血清326份,抗体阳性率为47.85%;检测哺乳仔猪血清324份,抗体阳性率为37.65%;检测保育猪血清316份,抗体阳性率为18.99%;检测育肥猪血清320份,抗体阳性率为30.63%。8个市县均有APP感染,其中文昌市APP抗体阳性率最高;不同规模猪场均有APP感染,其中中型规模猪场APP抗体阳性率最高;不同品种猪均有APP感染,其中杜长陆三元杂猪APP抗体阳性率最高。说明PCP在海南省部分规模猪场中普遍存在,对猪场进行PCP的控制是十分必要的。     

伊川县猪弓形虫病血清学调查与分析

利用间接血凝试验,对河南省伊川县部分规模化猪场的897份血清样品进行了弓形虫抗体检测,以抗体效价≥1：64为阳性判定标准,结果发现,上述被检样品的总阳性率为17．7％（159／897）,母猪、保育仔猪、育肥猪的阳性率分别为27．9％（76／272）、158％（29／183）、12．2％（51／442）。阳性母猪、保育仔猪和育肥猪抗体效价的几何平均数分别为1：229．4、1：89．4、1：169．7。     

不同年龄猪群中猪瘟抗体监测及免疫效果分析

为制订合理的猪瘟免疫程序,本研究采用正向间接血凝试验(IHA)对某规模化猪场进行猪瘟免疫监测和分析。结果表明:猪瘟母源抗体的合格率、抗体效价平均值均存在随着仔猪日龄的增长而呈逐渐下降的趋势;35 d～40 d仔猪母源抗体的合格率达78.79%、抗体平均效价为5.97 Log2;仔猪35 d～40 d实施猪瘟首免,其一免抗体合格率和抗体效价均比20 d首免有所提高;同一窝仔猪的猪瘟母源抗体,有11%窝次的猪差距在3个～8个滴度;母猪猪瘟免疫抗体的合格率,一胎母猪稍低,其它经产母猪基本接近;猪瘟抗体效价的平均值随胎龄增加而升高,并且抗体的离散度则随胎龄增加而缩小。因此,在母猪实施与仔猪同时免疫的猪场,40日龄左右是较佳的首免日期。     

An abattoir survey of pneumonia and pleuritis in slaughter weight swine from 9 selected herds. III. Serological findings and their relationship to pathomorphological and microbiological findings

Blood samples from 777 pigs, originating from 9 different herds, were collected at slaughter and examined for antibodies to Mycoplasma hyopneumoniae and Actinobacillus (Haemophilus) pleuropneumoniae by the indirect hemagglutination assay (IHA) and the complement fixation (CF) test, respectively. Results were compared to pathological and microbiological findings. Antibodies to M. hyopneumoniae in positive titers of 1/80 or higher were found in 62% of the samples. The relationship between positive IHA titers to M. hyopneumoniae and gross findings indicative of enzootic pneumonia of pigs (EPP), histological findings indicative of EPP, the isolation of M. hyopneumoniae and the demonstration of M. hyopneumoniae by indirect immunofluorescent testing ranged from 64% to 68%. No correlation was noted between positive IHA titers and the isolation of Mycoplasma flocculare. Positive antibody titers to A. pleuropneumoniae of 1/10 or higher were detected in 5% to 85% of the samples from individual herds. Positive titers to A. pleuropneumoniae serotype 2 were found in 71% to 79% of the sampled animals from herds with high frequencies of pneumonic lesions indicative of pleuropneumonia. In herds with low frequencies of pleuropneumonia, positive titers were recorded in from 0 to 4% of the tested pigs. However, no statistical association was found between pleuropneumonia and positive titers to A. pleuropneumoniae serotype 2 in individual animals. Twenty-one per cent of samples with positive CF titers to A. pleuropneumoniae showed antibodies to more than one serotype.     

猪圆环病毒2型感染对猪繁殖与呼吸综合征灭活疫苗体液免疫的影响

本试验采用ELISA方法对单独接种猪繁殖与呼吸综合征病毒(PRRSV)变异株灭活苗组(HP组,n=3)和PCV2感染且出现病毒血症后接种PRRSV变异株灭活苗组(PCV2/HP组,n=3)不同时相血清中的PRRSV抗体进行检测;并对HP和PCV2/HP组血清中PCV2特异的抗体和核酸分别进行ELISA和荧光定量PCR检测。结果表明,在首免后70 d HP组血清平均抗体效价极显著高于PCV2/HP组(P<0.01);首免后56、63和77 d HP组平均抗体效价明显高于PCV2/HP组。其中在首免后56和63 d HP组抗体阳性率均达67%(2/3),PCV2/HP组在相应时相抗体阳性率为0;在首免后70和77 d HP组抗体阳性率均达100%(3/3),PCV2/HP组在相应时相抗体阳性率仅为0和33%(1/3)。结果提示PCV2感染可在一定程度上抑制PRRSV变异株(JXA1)特异性的抗体反应。     

重组白细胞介素-2提高PRRS抗体阳性猪的猪瘟疫苗免疫效果试验

观察了重组白细胞介素-2（IL-2）对健康成年猪和PRRS抗体阳性猪的猪瘟疫苗免疫效果的影响。结果显示,重组IL-2和猪瘟疫苗一起免疫健康猪,20d后间接血凝抗体滴度达到1∶64的猪的比例为87.5％,而不注射IL-2的对照组抗体滴度可以达到这一水平的比例只有25％。给经2次猪瘟疫苗免疫但抗体滴度在1∶32以下的PRRS抗体阳性猪单独注射IL-2,20d后,注射前检测不到抗体的猪都检测到了抗体,注射前抗体滴度在1∶8～1∶16之间的猪的抗体滴度提高到1∶32～1∶64。再次用猪瘟疫苗和IL-2共同免疫,可使抗体滴度提高4倍以上。而不注射的对照组抗体滴度则略有下降。说明重组IL-2可以减轻PRRS感染所引起的免疫抑制,提高猪瘟疫苗的免疫效果。     

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。     

广东部分地区H1和H3亚型猪流感抗体监测和病毒分离

从广东省17个未免疫猪流感病毒(SIV)疫苗的规模化猪场和3个肉联厂的待屠宰猪群中采集2 155份血清样品,采用ELISA方法进行猪流感的血清学调查。结果发现,种猪和肉猪H1亚型猪流感抗体阳性率分别为39.6%(329/830)和37.6%(498/1325),H3亚型抗体阳性率分别为10.8%(90/830)和4.6%(61/1325),H1+H3阳性率分别为5.2%(43/830)和1.8%(25/1325)。从281份猪鼻拭样品和肺样品中分离并鉴定出5株猪流感病毒,其中H1N1亚型3株,H3N2亚型和H1N2亚型各1株。     

非洲猪瘟病毒全长与截短p72蛋白的抗原性比较

比较非洲猪瘟病毒(African swine fever virus,ASFV)全长p72与截短p72蛋白(p72s)的抗原性,为ASFV特异性抗体检测技术研究提供试验依据.应用大肠杆菌表达系统表达p72和p72s蛋白,应用Western blot和液相色谱—质谱联用(LC-MS/MS)技术鉴定表达的蛋白,分析蛋白的抗...     

Potentiating effect of adjuvants on humoral immunity to porcine parvovirus vaccines in guinea pigs

Fourteen different adjuvants, given either in single or combined form with another compound were compared in guinea pigs for their ability to potentiate humoral immunity to porcine parvovirus (PPV) antigen after 2 vaccinations. Two injections were given, the second 3 weeks following the initial vaccination. Antibody concentrations to PPV in sera from injected animals were measured over a 5-week period by the hemagglutination inhibition test. At the conclusion of the experiment, guinea pigs injected with the following adjuvants and PPV antigen: CP-20 961 (Avridin), 50% aluminum hydroxide gel, ethylene maleic anhydride (EMA), oil and water emulsion (O/W) and dimethyl-dioctadecyl-ammonium bromide (DDA) immunologically responded with high geometric mean HI titers (380, 224 and 427, 602, 512, 1202 respectively), whereas guinea pigs receiving Emulsan, sodium dodecyl sulfate (SDS), L-121, combinations of Emulsan/aluminum hydroxide, SDS/aluminum hydroxide and B. pertussis/aluminum hydroxide responded with low mean titers (54, 64, 18, 27, 11, 64, 14, 20 respectively). Guinea pigs injected with antigen without adjuvant responded weakly with geometric mean titers of 3.3 and 16 for the 2 groups tested. Prior to booster injection, guinea pigs immunized with 13 of the preparations had low (less than 4) or undetectable antibody titers. Antibody titers from guinea pigs receiving DDA adjuvant continued to rise throughout the duration of the experiment and at the conclusion had the highest mean titers of the groups tested (1202). The 2 groups immunized with 50% aluminum hydroxide gel had high mean titers (224, 427), but in both instances there was a wide range of titers within a group evidenced by high standard deviations. In contrast, guinea pigs receiving either DDA, CP-20 961, O/W or EMA had antibody titers within a narrow range and small standard deviation. The significance of aluminum hydroxide gel concentration on immunogenicity is discussed.     

Antibody responses of guinea-pigs, rabbits and pigs to inactivated porcine parvovirus vaccines

Antibody responses were compared in guinea-pigs, rabbits and pigs following vaccination with inactivated porcine parvovirus (PPV) vaccines. Mean PPV hemagglutination inhibition (HI) antibody titers of 52, 56 and 36 at 1 week after first vaccination and 896, 640 and 512 at 2 weeks after second vaccination were detected in guinea-pigs, rabbits and pigs, respectively. PPV vaccines prepared with greater concentrations of virus, as determined by hemagglutination (HA) units, and of aluminum hydroxide gel adjuvant, induced higher HI antibody titers in guinea-pigs. Optimal concentrations for inducing consistently high antibody titers consisted of vaccine virus with a HA titer of 256/0.1 ml and gel adjuvant at a final concentration of 50%. A second vaccination at 4 weeks compared to 2 or 3 weeks after first vaccination resulted in higher mean HI titers. These data provide preliminary information on the use of guinea-pigs or rabbits as laboratory animal models for testing the potency of PPV vaccines.