某猪场猪瘟与猪蓝耳病的免疫效果分析

本研究采集某猪场公猪、后备母猪、怀孕前期、怀孕中期、怀孕后期、哺乳期母猪、仔猪(0～15 d、16～30 d)、保育猪(31～45 d、46～75 d)及育肥猪(76～100 d、100 d至出栏) 64份血清,用进口ELISA抗体检测试剂盒进行猪瘟及猪蓝耳抗体检测。猪瘟抗体检测结果表明公猪及母猪各组的阳性率为100%,抗体较好,仔猪至保育和育肥阶段抗体阳性率仅为23.33%,抗体水平较低,应在仔猪阶段加强猪瘟免疫;猪蓝耳抗体总阳性率为54.69%,公猪及母猪各组阳性率在50%以下,仔猪至育肥猪各组间40%～100%波动较大,猪蓝耳感染存在较大风险或已存在猪蓝耳野毒感染。猪场抗体监测有助于了解猪场免疫状态,可为及时调整或修改免疫程序、降低传染病发病风险提供科学依据。     

海南省猪场弓形虫病血清流行病学调查

对采自海南省各市县12个猪场285份血清用间接血凝(IHA)试验进行猪弓形虫病抗体检测。结果表明,猪场整体阳性率为39.30%,其中公猪群抗体阳性率为34.21%;母猪群抗体阳性率为64.23%;仔猪群抗体阳性率为21.15%;肥猪群抗体阳性率为0。仔猪群与公猪群抗体阳性率差异不显著;肥猪群与仔猪群、母猪群、公猪群抗体阳性率差异极显著;母猪群与公猪群、仔猪群抗体阳性率差异极显著。各猪场弓形虫病感染率有所差异,抗体阳性率在0～82.35%之间。     

海南省规模化猪场衣原体病血清流行病学调查

对采自海南省各市县13个猪场的972份血清用间接血凝(IHA)试验进行猪衣原体病抗体检测,结果表明,猪场整体抗体阳性率为49.49%,其中母猪群抗体阳性率为53.66%,肥猪群抗体阳性率为47.79%,仔猪群抗体阳性率为27.78%,仔猪群抗体阳性率与肥猪群、母猪群抗体阳性率差异极显著(P<0.01),肥猪群抗体阳性率与母猪群抗体阳性率差异不显著(P>0.05);各猪场衣原体病感染率有所差异,抗体阳性率在31.11%～86.21%之间。     

甘肃省猪乙型脑炎血清学抽样调查结果及防控措施

2020—2021年随机选取甘肃省9个市(州)的19个中小型猪场474份猪血清进行非免疫抗体检测。抗体阳性182份,阳性率38.40%。检测13个猪场育肥猪抗体阳性率达41.22%,检测10个猪场母猪抗体阳性率达34.15%,检测4个猪场公猪抗体阳性率达20.00%,检测6个猪场仔猪抗体阳性率达26.87%,育肥猪阳性率最高,其次是母猪,公猪阳性率最低。东南部较潮湿地区阳性率高于中部半干旱地区和西部干旱地区。因此,要结合地理位置和气候条件,在疫病高发季节强化疫情监测和饲养管理,加强对猪群的免疫和易感人群的防范工作。     

四川省内江市猪瘟、猪口蹄疫免疫效果监测与分析

为了掌握四川省内江市猪瘟、猪口蹄疫的免疫现状,用正向间接血凝试验检测了2012-2014年采集的1 649份血清样品。结果表明,猪场规模越大,饲养管理水平越高,猪瘟和猪口蹄疫抗体合格率越高。同时,不同年龄段抗体水平也不同,种公猪、母猪的抗体水平高于育肥猪和仔猪。     

猪圆环病毒2型的血清流行病学调查

从重庆武隆县猪场及农村散养户采集猪血清286份,用ELISA检测试剂盒对PCV-2抗体进行了检测,结果发现,PCV-2抗体阳性率为79.0%,其中断奶仔猪、育肥猪、经产母猪、种公猪的抗体阳性率分别为76.6%、74.2%、86.2%、82.1%,表明在重庆武隆地区PCV-2感染已普遍存在。     

猪衣原体病的调查

1986-2002年从全国17个省部分猪场收集猪血清17448份,用间接血凝试验（IHA）检测猪衣原体抗体,其中青海猪衣原体抗体阳性检出率为33.3%和42.9%,四川11.5%和80.0%,新疆22.2%,陕西38.0%。广西21.2%。云南24.5%。广东50.2%。甘肃42.2%和36.0%。河南35.1%和18.2%。宁夏15.1%,海南38.2%,湖北37.5%,湖南16.7%。江西50.0%,辽宁43.2%。黑龙江77.1%,吉林20.5%。并从一些省区所采的流产胎儿,流产母猪阴道拭子,仔猪肺炎死亡病例病料分离到鹦鹉热衣原体。从东北三省猪群检出衣原体抗体在国内属首次报道。     

安徽地区猪传染性胸膜肺炎流行病学调查

为了解安徽地区猪传染性胸膜肺炎(PCP)的流行情况,本研究采用ApxIV-ELISA试剂盒对1 288份猪血清样品中胸膜肺炎放线杆菌(APP)感染抗体进行检测,并采用PCR方法对573份母猪鼻腔棉拭子样品和92份屠宰生猪肺脏样品的APP核酸检测。结果显示,APP感染抗体总阳性率为26.40%,母猪/后备母猪/公猪APP感染抗体阳性率(45.47%)高于哺乳仔猪(28.02%)、保育猪(6.16%)、育肥猪(7.20%);夏季(41.42%)高于春季(29.75%)、秋季(26.35%)、冬季(19.26%);淮北地区(30.73%)和江淮地区(28.57%)高于皖南地区(13.77%);中型猪场(47.16%)高于大型猪场(19.28%)和小型猪场及散养户(23.15%);屠宰生猪肺脏样品APP核酸阳性率(11.96%)高于母猪鼻腔棉拭子(1.92%)。ELISA试剂盒与PCR同步检测的符合率为49.77%。表明PCP在安徽地区普遍存在,为引起猪呼吸道疾病综合征的主要原因之一。本研究结果为PCP的有效防控提供了现地调查依据。     

规模化猪场O型口蹄疫抗体水平监测与分析

为切实猪O型口蹄疫抗体的免疫情况,科学评估免疫的质量,采用间接ELISA方法定点对17个规模猪场育肥猪108份、保育猪117份、哺乳仔猪121份、母猪60份、公猪104份(春、秋季各510份),共计1 020份猪O型口蹄疫免疫抗体血清进行检测,结果显示,春季阳性414份,平均免疫合格率为81.83%,大于农业部规定的标准(≥70.00%),免疫合格率较低的为65.00%和68.33%,未达到农业部规定的标准,不同类型猪的阳性水平春季平均阳性率74.10%,公猪阳性率94.23%,阳性率最高,其次是母猪77.78%,依次是育肥猪72.22%、保育猪70.08%、哺乳仔猪56.20%。秋季平均免疫合格率为85.00%,大于农业部规定的标准,免疫合格率最高96.67%,最低合格率70.00%,不同类型猪阳性水平,平均阳性率81.70%,母猪阳性率95.56%,阳性率最高,其次是育肥猪89.81%,然后依次是公猪88.46%、保育猪74.35%、哺乳仔猪60.33%。综合:2015年两次监测猪O型口蹄疫抗体中,春、秋季各地区猪O型口蹄疫抗体水平差异较大,大部地区免疫合格率均大于农业部规定的标准,部分地区抗体水平有待提高,哺乳仔猪的免疫水平较低。     

临沧部分地区猪细小病毒感染的血清学调查

为了解临沧地区猪细小病毒(PPV)的感染情况,采用酶联免疫吸附试验(ELISA),对临沧部分地区规模化猪场和散养户饲养猪的190份血清样品进行了猪细小病毒抗体检测。结果表明,临沧地区规模化猪场和散养户的猪细小病毒抗体总阳性率为66.32%,其中规模化猪场为71.52%,散养户猪群为32.00%,不同年龄段的种公猪、种母猪、育肥猪、仔猪抗体阳性率分别为50.00%、82.52%、43.59%、50.00%。从检测结果说明临沧地区存在猪细小病毒的感染。     

羊流产嗜衣原体病和弓形虫病IHA与ELISA诊断方法的比较

通过比较研究羊流产嗜衣原体与弓形虫抗体的间接血凝试验(IHA)与酶联免疫吸附试验(ELISA)检测结果,选择适宜贵州省山羊流产血清学调查的检测方法。通过IHA和ELISA两种方法对贵州省195份山羊血清进行羊流产嗜衣原体与弓形虫抗体的检测,统计并分析两种疫病的阳性符合率、阴性符合率和总符合率。结果表明,羊流产嗜衣原体与弓形虫IHA与ELISA的总符合率分别为77.95%和78.97%,阳性符合率均仅为50%,阴性符合率为80.45%和79.27%。说明在检测两种疫病血清抗体方面,IHA比ELISA更适合在贵州省基层推广。     

青海省部分地区猪圆环病毒2型感染的血清学调查

应用猪圆环病毒2型抗体酶联免疫检测试剂盒,测定了青海省省内8个猪场的1 000个血清样本,对不同地区、不同年龄猪的进行了血清学调查.结果显示,青海省8个猪场均有猪圆环病毒2型( PCV-2)感染,全省猪的PCV-2感染的平均血清阳性率为25.9％,其中母猪、种公猪、生长育肥猪、保育猪及哺乳仔猪抗体阳性率分别35.3％、...     

Immunoblotting, ELISA and culture evidence for Chlamydiaceae in sows on 258 Belgian farms

The prevalence of Chlamydiaceae infections on 258 closed pig breeding farms in Belgium was examined. For this purpose, 258 farms were randomly selected in the provinces West-Vlaanderen (44%), Oost-Vlaanderen (20%), Antwerpen (10%) and Vlaams-Brabant (6%). Of all farms examined, 96.5% were positive for Chlamydia-specific antibodies in ELISA and most were moderately to strongly positive. ELISA results revealed only 9 (3.5%) sero-negative farms. None of the ELISA negative sera reacted in immunoblotting. Only 212 of 249 ELISA positive sera reacted positive in immunoblotting. Additionally, 23 autopsy samples were examined by isolation in Vero cells. The major outer membrane sequence of the one isolate obtained showed 98.6% amino acid homology to the one of Chlamydophila psittaci strain CP3, formerly isolated from a pigeon. Present observations indicate that chlamydial infections are nearly endemic in the Belgian pig population and that Belgian pigs can become infected with C. psittaci. Nevertheless, the role and significance of Chlamydiaceae as pathogens in pigs remain unsolved and require further investigation.     

黑龙江省东部地区猪蓝耳病流行检测分析

为了解黑龙江省东部地区猪蓝耳病(PRRS)的流行情况,从黑龙江省东部地区的牡丹江市、宁安市、海林市、绥芬河市、鸡西市、鸡东市、佳木斯市、密山市、虎林等地,共采集猪血清样本663份。采样猪群包括公猪、母猪、仔猪、育肥猪。采集的猪场包括规模化猪场、小规模的猪场及散养户。应用ELISA方法对该省东部地区猪蓝耳病的流行情况进行血清学调查,结果显示:663份血清中,其中,134头为阳性,阳性率为20.21%;529头为阴性,阴性率为79.79%;S/P值大于2.0的26头,占总阳性比率的19.40%。     

Prevalence of Chlamydiaceae and Mollicutes on the genital mucosa and serological findings in dairy cattle

It was the aim of this project to obtain information on the prevalence of Chlamydiaceae and Mollicutes and their potential importance for reproductive problems in cattle. Cervical or vaginal swabs were taken from 644 animals in 196 farms and blood samples were collected from 375 cattle. Out of the animals, 6.8% had aborted within the last 12 months, 2.6% showed clinical vaginitis and 11.6% clinical endometritis. Chlamydiaceae were detected and identified by PCR followed by restriction fragment length polymorphism (RFLP) analysis. For the detection and identification of Mollicutes cultivation procedures, biochemical differentiation and serological identification were used. Sera were tested for antibodies against Chlamydiaceae and Mycoplasma (M.) bovis by ELISA and against M. bovigenitalium by Western blot analysis. Chlamydophila (Cp.) abortus was found in three cervical swabs. Cp. pecorum was detected in 9% of cervical or vaginal swabs. The majority of Cp. species found was Cp. pecorum and thus fertility problems caused by Cp. abortus are limited. M. bovis was found in only one genital swab. M. bovigenitalium was rarely diagnosed (3% of cervical and 2% of vaginal swabs). M. bovigenitalium was found more often in cattle having aborted (4/32 animals) than in cattle without history of abortion (5/220, p<0.05). Ureaplasma (U.) diversum existed in 12% of cervical and 36% of vaginal swabs and was found in 8 out of 17 animals with vaginitis. Out of the animals tested, 44.9% were seropositive for Chlamydiaceae, 14.8% for M. bovis and 27.3% for M. bovigenitalium.     

内蒙古地区猪圆环病毒Ⅱ型感染的血清学调查

本实验应用酶联免疫吸附实验（ELIsA）方法对内蒙古地区部分未经PCV-2免疫的猪场猪只780份血样进行抗体阳性检测,结果显示,不同猪场均有PCV-2感染,PCV-2抗体平均阳性率为38．6％（301／780）,经产母猪阳性率为38．3％（51／133）,后备母猪阳性率为38．7％（46／119）,种公猪阳性感染率为23．5％（8／34）,哺乳仔猪阳性率为42．8％（80／187）,断奶仔猪阳性率为40．9％（70／171）,育肥猪阳性率为33．8％（46／136）。结果表明,内蒙古地区养猪场普遍存在猪圆环病毒II型（pcv-2）感染？     

Field evaluation of a new commercially available ELISA based on a recombinant antigen for diagnosing Chlamydophila abortus (Chlamydia psittaci serotype 1) infection

A new commercially available ELISA (ELISAr-Chlamydia) for detecting antibodies against Chlamydophila abortus has been evaluated using sheep field serum samples. The ELISA is based on a recombinant antigen which expresses part of a protein from the 80-90kDa family that is specific to C. abortus. Sera (105) from six flocks with confirmed ovine chlamydial abortion (OEA) outbreaks were used in this study, as well as sera (258) from 18 flocks which had suffered no OEA in the last lambing. The ELISAr-Chlamydia was compared with the complement fixation test (CFT) and with an ELISA using purified C. abortus elementary bodies (ELISA-EB), employing as reference technique a comparative microimmunofluorescence test that differentiates C. abortus infection from Chlamydophila pecorum infection. The results showed that the sensitivity of ELISAr-Chlamydia was 90.9% with a specificity of 85.9%, the sensitivity of CFT was 71.0% with a specificity of 83.6%, while the sensitivity of ELISA-EB was 95.2% and the specificity was 54.2%. Furthermore, ELISAr-Chlamydia was the test with fewer false positives resulting from positive reactivity to C. pecorum, although 15% of the sera positive for C. pecorum but negative for C. abortus antibodies reacted positively. This study demonstrated with field material that ELISAr-Chlamydia provides the most balanced results between sensitivity and specificity, especially in flocks with no clinical OEA but reactivity to C. abortus.     

四川省PPV与PCV2的病原流行病学调查

从四川省21个规模化猪场采集样品273份,利用PCR方法检测并分析了猪细小病毒和猪圆环病毒的感染及混合感染情况,结果共检出PPV病原阳性样品47份（占17．22％）;PPV阳性猪场8个（占38．1％）;种猪的感染率较高,仔猪感染率相对较低;检出PCV2病原阳性样品143份（占52．38％）,PCV2阳性猪场18个（占85．7％）;PCV2感染随猪年龄的增长而升高;检出PPV和PCV2混合感染样品29份（占10．62％）;同时存在PPV和PCV2的猪场6个（占28．7％）,混合感染主要集中在母猪和保育仔猪阶段。仅有3个猪场未检出PPV和PCV2病原,占14．3％。该结果说明PPV与PCV2及其混合感染在四川省流行广泛,对养殖业构成了较严重的危害。     

Investigation of Chlamydophila spp. in dairy cows with reproductive disorders

Background

Reports worldwide indicate high prevalence of Chlamydophila spp. infection in cattle. To assess the prevalence in Sweden, 525 cows in 70 dairy herds with reproductive disorders was investigated.

Methods

To detect antibodies two commercially available kits were used. Moreover, 107 specimens, including vaginal swabs, organ tissues and milk were analysed by Polymerase Chain Reaction (PCR).

Results

Two (0.4%) cows were seropositive in the Pourquier Cp. abortus ELISA. The seroprevalence with the Chekit ELISA was 28% with no difference between cases and controls. Five specimens were positive in real-time PCR and further analysed by nested PCR. Cp. pecorum was confirmed by partial omp1 DNA sequencing of the nested PCR product of vaginal swabs from control cows.

Conclusion

The results suggest that Cp. abortus infection is absent or rare in Swedish cows whereas Cp. pecorum is probably more spread. They also suggest that Chlamydophila spp. are not related to reproduction disorders in Swedish cattle.     

宁夏两家猪场猪萨佩罗病毒的检测与多样性分析

为了解宁夏地区猪群中萨佩罗病毒(PSV)的感染流行情况,本研究通过RT-PCR的方法对不同区域的2个规模化养猪场的160份临床健康猪咽拭子和肛拭子样品进行了检测。试验表明,所检的2个养殖场均存在PSV感染,总体平均阳性率为61.25%,其中咽拭子检出率为7.5%,肛拭子猪检出率为58.75%。试验结果表明PSV在宁夏地区普遍存在。