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2007—2011年贵州省猪圆环病毒感染的流行病学调查 总被引：1，自引：0，他引：1
为了解贵州省近5年来猪圆环病毒的感染情况,以便更好地控制该病,贵州大学预防兽医学实验室收集2007—2011年贵州省9个市(州)不同饲养规模(养猪户)及屠宰场未免疫猪血清样本4 980头份,2011年19个猪场(屠宰场)的可疑病料133份,采用ELISA及PCR方法对猪圆环病毒2型(PCV2)抗体及病原核酸进行检测。结果显示:贵州省9个市(州)不同饲养规模(养猪户)、生猪屠宰场及不同生长阶段均可检出PCV2抗体,总体阳性率为43.45%(2 164/4 980);2007—2011年抗体阳性率呈现稳步上升趋势。对不同饲养规模不同生长阶段PCV2抗体阳性率进行比较,总趋势表现为:规模饲养场>种畜场>散养户,且散养户与规模饲养场、散养户与种畜场之间均差异显著(P<0.05);不同生长阶段PCV2抗体阳性率表现为经产母猪>种公猪>后备母猪>哺乳仔猪>断奶仔猪及育成猪。PCR检测的19个猪场133份可疑病料中,有16个猪场PCV2检测为阳性,检出率达84.21%(16/19),103份病料检出PCV2病原核酸,阳性率达77.44%(103/133)。说明贵州省PCV2的感染已经日益严重。本研究为该病的综合防控提供流行病学资料。 相似文献
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为了确诊贵州省某规模化猪场保育仔猪异常死亡原因,从怀孕母猪、产房母猪、后备母猪、种公猪、哺乳仔猪、保育仔猪6个猪群采集90份血清样本采用ELISA方法分别进行血清抗体检测,并对采集的90份血清样本和1份病死猪淋巴结组织采用荧光PCR方法进行病原学检测。结果:6个猪群综合的猪瘟病毒、猪蓝耳病病毒、伪狂犬病病毒g B蛋白、伪狂犬病病毒g E蛋白血清抗体阳性率分别为87.78%、70.00%、88.89%、4.44%;猪瘟病毒、猪蓝耳病病毒、伪狂犬病病毒病原核酸检测显示阴性,猪圆环病毒2型病原核酸检测淋巴结组织样本显示阳性。试验结果表明,引起该猪场保育仔猪死亡的原因为猪圆环病毒2型感染。同时,怀孕母猪群出现了伪狂犬病病毒g E蛋白抗体阳性,提示怀孕母猪群可能存在猪伪狂犬病野毒感染。 相似文献
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《中国兽医杂志》2014,(5)
为了弄清猪2型圆环病毒感染在该猪场的感染状况、流行特点及优势基因型等情况。采用ELISA检测技术和PCR技术,对新疆某规模化猪场的不同生产阶段猪群进行猪2型圆环病毒(PCV2)抗体检测和基因型检测。结果猪圆环病毒病(PCVD)在该猪场猪群中的平均抗体阳性率为72.41%,不同生长阶段的猪群感染情况分别为哺乳仔猪69.74%、断奶仔猪62.75%、育肥猪77.88%、母猪81.67%以及种公猪83.33%;对采集的11份抗体阳性的断奶猪只的脏器病料PCR检测,其中5份为PCR阳性(45.45%),经克隆测序分析发现,该猪场5株PCV2毒株序列之间的相似性在99.3%99.9%之间,且均属于PCV2b这一亚型。结果表明,该猪场的PCV2感染流行已非常严重,整体流行特征表现为猪只日龄越大,感染情况越严重,且流行的优势基因型为PCV2b亚型,应该引起养殖户的高度重视,需要立即采取针对有效的防治净化措施。 相似文献
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《养猪》2021,(4)
为了解2019—2020年北疆某规模化养猪场猪圆环病毒2型(PCV2)抗体及抗原情况,研究采用间接酶联免疫吸附试验(ELISA)、PCR方法对采集的671份猪血清进行PCV2抗体检测及部分样品进行PCV2抗原检测。结果显示,该猪场PCV2抗体平均阳性率为62.00%(416/671),低于国家规定标准(70.00%)。不同类别猪群中,哺乳仔猪群、保育猪群、经产母猪群、后备猪群、肥育猪群、种公猪群抗体阳性率分别为38.46%(50/130)、29.20%(33/113)、83.93%(141/168)、75.34%(55/73)、72.30%(107/148)和76.92%(30/39)。通过对抗体过高的猪只进行抗原检测,发现各个猪群都存在PCV2感染情况。需要对种猪群逐个检查PCV2感染情况,并调整完善现有的免疫程序,进一步加强该猪场对猪PCV2的免疫防控。 相似文献
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猪圆环病毒病在规模化养猪场发生日益普遍,它已成为影响养猪业的主要传染病.我们从新乡市长垣县、封丘县、辉县市、卫辉市、获嘉县、原阳县、新乡县、延津县16个猪场采集各类猪的血清样品109份,其中断奶仔猪血清47份,后备母猪血清30份,经产母猪血清32份,应用酶联免疫吸附试验(ELISA)对以上血清样品进行猪圆环病毒Ⅱ型(PCV-2)血清抗体的检测.结果共检出阳性血清59份,总阳性率为54.13%(59/109),断奶仔猪抗体阳性率为48.94%(23/47),后备母猪抗体阳性率为56.67%(17/30),经产母猪抗体阳性率为59.38%(19/32).结果显示:所有被检猪场均有PCV-2抗体阳性猪存在,从检测结果可以看出,本市一些猪场正处于PCV-2感染的高发阶段.因此我们必须加强猪群净化、加强饲养管理、搞好环境卫生等综合防制对策来控制该病的发生. 相似文献
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为了解辽宁省猪圆环病毒2型（PCV2）感染情况，对来自辽宁省14个市的59个规模化商品猪场的734份血清、17个种猪场的329份血清、45户农村散养户的146份血清，采用ELISA（酶联免疫吸附试验）方法进行PCV2抗体检测。结果显示，59个规模化猪场中有51个为阳性，阳性率86.4%（51/59），其734份样品中有351份为阳性，样品阳性率为47.8%（351/734）；17个种猪场中有15个为阳性，阳性率为88.2%（15/17），其种猪群样品阳性率为47.6%（81/170），仔猪群样品阳性率为29.6%（47/159）；45户散养户中有23户为阳性，阳性率为51.1%（23/45），检测的146份样品有58份阳性，样品阳性率39.7%（58/146）。可见，PCV2在辽宁省各地的感染已经很普遍，并且种猪群感染率高于仔猪群，规模场的感染率高于农村散养户。 相似文献
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猪繁殖与呼吸综合征病毒变异株与猪瘟病毒等混合感染的调查与分析 总被引：5，自引：0，他引：5
从华南地区PRRSV变异株(NSP21 594-1 680 bp缺失)核酸阳性的23个规模场、42个个体养殖场和15个散养户,随机采集发病、同群猪血清197份、组织样品115份,调查猪群个体感染PRRSV变异株情况,并对PRRSV变异株核酸阳性样品进行CSFV、PRV、PCV2、SIV检测,调查PRRSV变异株混合感染情况.结果表明:312份样品中224份PRRSV变异株核酸阳性,阳性率71.79%;PRRSV变异株核酸阳性样品中CSFV、PRV、PCV2核酸阳性样品分别为12份、2份,35份,阳性率分别为5.35%、0.89%、15.6%;80个场(群)均未检测到SIV核酸的存在.25个场(群)存在病毒混合感染,其中PRRSV变异株/CSFV、PRRSV变异株/PRV、PRRSV变异株/PCV2二重感染和PRRSV变异株/CSFV/PCV2、PRRSV变异株/PRV/PCV2三重感染猪场(群)百分率分别为5%、1.25%、21.25%和2.5%、1.25%.PRRSV变异株(NSP21594-1680变异)是造成猪场(群)重大损失的直接原因,并可与CSFV、PRV、PCV2等病毒出现混合感染,与PCV2混合感染比率较高. 相似文献
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Porcine circovirus type 2 (PCV2) can be vertically transmitted resulting in fetal infection with or without clinical signs and lesions. The primary objective of this study was to assess the prevalence of intrauterine PCV2 infection in clinically normal newborn piglets in conventional pork production facilities. Five commercial breeding herds located in the U.S. and Mexico were included in the study. A total of 125 sows and 3-5 neonatal piglets per sow were arbitrarily selected. Blood and colostrum samples were collected from sows. Blood was collected from piglets prior to suckling. All samples were analyzed for the presence of anti-PCV2 IgG antibodies and presence and amount of PCV2 DNA. In addition, PCV2 DNA positive samples were further subtyped into PCV2a and PCV2b. All (125/125) sow colostrum samples and 96.8% (121/125) of the sow serum samples and 21.4% (107/499) of the piglet pre-suckle serum samples were positive for anti-PCV2 IgG antibody. The overall PCV2 DNA prevalence was 47.2% (59/125) in sow serum, 40.8% (51/125) in sow colostrum, and 39.9% (199/499) in pre-suckle piglet serum. In the PCV2 DNA positive samples, PCV2b was detected at a higher frequency (69.5% for sow serum, 84.3% for sow colostrum, and 74.4% for piglet serum) compared to PCV2a (18.6% for sow serum, 9.8% for sow colostrum, and 15.6% for piglet serum). Concurrent PCV2a and PCV2b infection was detected in 11.9% of the sow serum, in 5.9% of the colostrum samples, and in 10.0% of the piglet serum samples. In conclusion, an unexpectedly high prevalence of PCV2 viremia was detected in healthy sows (serum and colostrum) and their pre-suckle piglets in the five breeding herds investigated and PCV2b was more prevalent than PCV2a. This information adds to the knowledge of PCV2 infection in breeding herds. 相似文献
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Calsamiglia M Fraile L Espinal A Cuxart A Seminati C Martín M Mateu E Domingo M Segalés J 《Research in veterinary science》2007,82(3):299-304
Previous studies have described a "litter effect" associated with mortality in postweaning multisystemic wasting syndrome (PMWS) affected farms. The main objective of this study was to evaluate litter mortality in different PMWS affected farms and to characterize it in relation to three variables of the sow: parity, porcine circovirus type 2 (PCV2) infectious status and PCV2 antibody titres. The study was performed in seven farms that experienced PMWS in nurseries and/or fattening areas. Fifteen sows from each farm were randomly selected from the same farrowing batch. Serum samples were analyzed for antibodies to PCV2 and for genomic detection of PCV2. Four piglets from each sow (60 piglets per farm) were selected and ear-tagged at birth. Out of 420 initial piglets, 104 (25%) died. Sixty three of them (60%) were necropsied, and 40 (63%) diagnosed as PMWS based on case definition criteria. Our results show that sow PCV2 viremia was significantly related to piglet mortality since more piglets per litter died from viremic than from non-viremic sows. Additionally, a significantly greater proportion of animals died from sows that had low antibody titres against PCV2 (39% vs. 18% from sows with medium to high antibody titres). The present study, of exploratory nature, confirms previous results and further characterizes the so called "litter effect" by establishing that the sow PCV2 status had a significant effect on litter mortality in PMWS affected farms. 相似文献
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The effects of transplacental porcine circovirus type 2 (PCV2) infection on porcine epidemic diarrhoea virus (PEDV)-induced enteritis were examined in neonatal piglets. Six pregnant sows were randomly allocated to an infected (n=3) or control group (n=3). Three pregnant sows were inoculated intranasally with 6 mL of tissue culture fluid containing 1.2 x 10(5) tissue culture infective doses 50% (TCID(50))/mL of PCV2 strain SNUVR000470 three weeks before the expected farrowing date. Three control pregnant sows were similarly exposed to uninfected cell culture supernatants. Thirty piglets from PCV2-infected sows were randomly assigned to two groups (A and B) of 15 piglets each. Another 30 piglets from noninfected sows were randomly assigned to two groups (C and D) of 15 piglets each. The piglets in groups A and C were dosed orally at three days of age with 2mL of virus stock (1 x 10(6.5) TCID(50)/mL) of the PEDV strain, SNUVR971496, at the third passage. The mean villous height and crypt depth (VH:CD) ratio in PEDV-infected piglets from PCV2-infected sows (group A) were significantly different from those of the PEDV-infected piglets from PCV2 negative sows (group C) at 36, 48, and 72 h post-inoculation (hpi) (P<0.05). In PEDV-infected piglets from PCV2-infected sows (group A), significantly more PEDV nucleic acid was detected in the jejunal tissues (P<0.05) at 24 hpi than in the same tissues of the PEDV-infected piglets from PCV2 negative sows (group C). Thereafter, at 36, 48, 60, and 70 hpi significantly more PEDV nucleic acid (P<0.05) was detected in the jejunal tissues of the PEDV-infected piglets from PCV2 negative sows (group C) than those of the PEDV-infected piglets from the PCV2-infected sows (group A). It is concluded that the clinical course of PEDV disease was markedly affected by transplacental infection of PCV2. 相似文献
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Ashoka Dangolla Preben Willeberg Henrik Bj rn Allan Roepstorff 《Preventive veterinary medicine》1996,27(3-4):197-209
Associations of the occurrence of Ascaris suum and Oesophagostomum spp. in sows with herd management factors were examined using logistic-binomial regression. The information used was from 11 to 78 sows sampled from each of 83 breeding herds (2961 sows in total) and examined for eggs per gram of faeces (EPG). A sow excreting at least 20 EPG was defined as ‘infected’. Management factors of the study herds were recorded using a questionnaire. A total of 263 sows from 50 herds (8.9% of sows) and 375 sows from 20 herds (12.7% of sows) were infected with A. suum and Oesophagostomum spp., respectively. For A. suum, sows from herds with more than 85 sows had significantly higher odds of being infected compared with those from 30 to 85 sows (P < 0.05). When bedding was provided for sows, the odds of A. suum infection was 5.4 compared with sows from herds in which bedding was not provided (P < 0.05). For Oesophagostomum spp., sows from herds with different specific pathogen free status had about one tenth the odds of being infected compared with those from conventional herds (P < 0.05). Sows that had been treated with anthelmintics had very low odds of being infected with Oesophagostomum spp. compared with those that were not treated (P < 0.05). The effects of these management factors in both final models did not differ when the definition of an ‘infected’ sow was changed. The present results suggest the importance of disposal of bedding material from pens in reducing the prevalence of A. suum in larger sow herds. Anthelmintic treatment is important in reducing the prevalence of Oesophagostomum spp. infection of sows. 相似文献
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【目的】寻找引起某猪场母猪屡次配种不孕的原因。【方法】采集母猪饲料槽中正在食用的饲料检测黄曲霉素B1含量;采集返情母猪的口鼻腔拭子、肛门拭子及血清,使用PCR、RT-PCR方法检测猪圆环病毒2型(Porcine circovirus 2,PCV2)、PCV3、猪伪狂犬病病毒(Pseudorabies virus,PRV)、猪细小病毒(Porcine parvovirus,PPV)、猪繁殖与呼吸综合征病毒(Porcine reproductive and respiratory syndrome virus,PRRSV)、猪瘟病毒(Classic swine fever virus,CSFV);随机剖检13头返情母猪,采集脾脏、淋巴结、脊髓、子宫、卵巢组织检测繁殖障碍性病毒的感染情况;对检测到的PCV2和PCV3部分阳性样品进行ORF2基因序列分析;观察母猪卵巢病理变化情况,汇总分析结果,诊断该场母猪受胎率低、持续返情的原因。【结果】该猪场饲料中黄曲霉素B1含量为4.5~9.0 μg/kg,均在GB 13078－2017规定的饲料中黄曲霉素B1允许范围内(＜20 μg/kg)。PCR、RT-PCR结果显示,口鼻腔拭子、肛门拭子和血清的PCV2、PCV3、PRV、PPV、PRRSV、CSFV检测结果均为阴性;13头母猪的PCV2阳性率为69.23%(9/13),PCV3阳性率为38.46%(5/13),PCV2和PCV3混合感染率为30.76%(4/13)。实时荧光定量PCR检测结果显示,PCV2在脊髓中的病毒载量最高,脾脏次之,淋巴结中最少;PCV3在脾脏中病毒载量最高,脊髓次之,卵巢中病毒载量最少。ORF2基因序列分析发现,PCV2为2d亚型,PCV3为3a亚型。卵巢病理切片观察发现,卵泡细胞数量减少,卵泡腔形状不规则、塌陷扁平。【结论】经过诊断确定该场母猪持续返情、屡配不孕的原因是PCV2和PCV3混合感染,进而引起繁殖障碍。根据诊断结果和该场情况,采取全群接种PCV2疫苗,配合全场消毒,加强生物安全防控,成功解决该场母猪繁殖障碍问题,恢复正常生产。 相似文献
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López-Soria S Nofrarías M Calsamiglia M Espinal A Valero O Ramírez-Mendoza H Mínguez A Serrano JM Marín O Callén A Segalés J 《Veterinary microbiology》2011,149(3-4):352-357
Post-weaning multisystemic wasting syndrome (PMWS) is a worldwide distributed disease of multifactorial origin and porcine circovirus type 2 (PCV2) has been identified as its essential infectious aetiology. Pig genetic background has been pointed to influence disease expression. In the present study, three different boar lines, namely A (100% Pietrain), B (50% Large White × 50% Pietrain) and C (25% Large White × 75% Duroc), were used to inseminate sows from the same genetic line (37.5% Large White × 37.5% Duroc × 25% Landrace) located on two PMWS-affected farms (farm-1 and farm-2). The PMWS clinical expression of their offspring was studied from weaning to slaughter, evaluating three parameters: total post-weaning mortality (PWM), PWM associated to PMWS (PMWS-PWM) and body weight (BW) evolution. The effect of other variables potentially related with PMWS, including sow and piglet PCV2 exposure, sow parity, piglet gender and piglet BW at weaning, were also considered in the study design. Overall, a total of 6.5% PWM and 4.3% PMWS-PWM occurred in the monitored farms. Pigs from boar line C showed the highest PWM (16.3%) and PMWS-PWM (12.4%), and the lowest BW; pigs from boar line A showed the lowest PWM (1.8%) and the highest BW. Furthermore, PWM was also higher in piglets from farm-2 and from multiparous sows. In farm-2, PMWS-PWM was higher in piglets from multiparous sows. Finally, BW was influenced by interactions between genetics and both farm and pig age, and was lower in piglets from farm-2. This study represents a consistent observation of the genetic background effect on PMWS clinical expression under field conditions. 相似文献
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使用流式细胞仪分离精子进行仔猪性别控制的研究 总被引：2，自引：2，他引：0
本研究旨在探索流式细胞仪分离精子在猪性别控制中的应用。使用流式细胞仪分离猪XY精子,而后通过母猪输卵管授精生产"预知"性别的仔猪,并使用吖啶橙染色法检测粗分离对精子核酸含量的影响。结果,成功利用分离获得的猪X和Y精子对母猪进行输卵管授精,母猪怀孕率、产仔率均为100%;输Y精子母猪产仔雄性率100%(♂6/6),对照母猪产仔雄性率57.14%(♂8/14);3头输X精子母猪产母仔率91.67%(♀11/12),对照母猪产雌性仔猪40%(♀2/5);使用性别分离精子不影响母猪的怀孕率、产仔率,但窝产仔数较低;吖啶橙染色法检测结果表明,流式细胞仪粗分离对猪精子核酸含量没有显著影响(P>0.05)。本研究结果提示,使用流式细胞仪分离精子授精可以有效改变仔猪的性别比例。本研究结果为猪分离精子性别控制技术的推广应用奠定了基础。 相似文献
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Prevalence of and risk factors for influenza in southern Ontario swine herds in 2001 and 2003 
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下载免费PDF全文 Zvonimir Poljak Catherine E. Dewey S. Wayne Martin Jette Christensen Susy Carman Robert M. Friendship 《Canadian journal of veterinary research》2008,72(1):7-17
This research included 2 prevalence studies and a risk-factor investigation conducted in 2001 at 93 sites with sows only, finishers only, or both. In 2001, 1300 serum samples from sows in 65 herds and 720 serum samples from finisher pigs in 72 herds were tested for antibodies to swine influenzavirus (SIV) of H1N1 subtype with an enzyme-linked immunosorbent assay (ELISA). In 2003, 1140 serum samples from sows in 76 herds were tested for antibodies to SIV of H3N2 subtype with a hemagglutination-inhibition assay based on A/Swine/Colorado/1/77 and A/Swine/Texas/4199-2/98 isolates. The apparent pig-level H1N1 seroprevalence in 2001 was 61.1% and 24.3% in sows and finishers, respectively. The apparent pig-level seroprevalence in 2003 for H3N2 A/Sw/CO/1/77 and A/Sw/TX/4199-2/98 in sows was 0.6% and 0.7%, respectively. The factors associated with sow-herd H1N1 positivity included pig or farm density at different geographic levels, an external source of breeding pigs, number of animals on site, and decreasing proximity to other barns. Higher-parity sows had higher odds of seropositivity, but there was significant random variability in this association among herds. The odds of finisher-herd SIV positivity were higher with large herd size, high pig farm density, and farrow-to-finish type of farm. Finisher herds were SIV-positive only if source sow herds were positive. Simultaneously, 45% of finisher herds were SIV-negative although sow source herds were positive. 相似文献
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Encephalomyocarditis virus (EMCV) has been found on pig farms worldwide and can cause myocarditis in young pigs and reproduction disorders in sows. So far, clinical signs of EMCV have not been reported in the Netherlands. The aim of this study was to estimate the seroprevalence of EMCV infection in Dutch sow herds. A total of 277 Dutch sow herds were randomly selected, from which 3237 serum samples were collected. These samples were tested for EMCV antibodies using the virus neutralization test (VN test). The apparent prevalence of EMCV antibodies was 9.3% in the total sow population, and the apparent herd prevalence was 58.8%. An exact determination of the prevalence of EMCV infections in the Dutch sow population was not possible because the characteristics of the VN test under field circumstances were not known. However, Dutch sow herds seem to be infected with EMCV because the distribution of positive blood samples in the tested sow population was significantly different from that expected if random false-positive reactions had occurred. 相似文献
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猪圆环病毒2型感染的血清学分析 总被引：37，自引：5，他引：37
应用间接免疫荧光技术 ,测定了浙江省内 4 4个猪场 2 0 0 0～ 2 0 0 2年间的 2 0 39个血清样本 ,对不同地区、年龄和品种猪的血清学数据进行了系统分析。结果显示 ,浙江省 4 4个猪场均有猪圆环病毒 2型 (PCV2 )感染 ,猪场的感染率为 10 0 % ,全省猪的 PCV2感染的平均血清阳性率为 5 8.31% ,其中种猪感染的血清阳性率为 5 9.38% ,断奶后猪感染的血清阳性率为 5 6 .6 5 %。长白种猪感染的血清阳性率为 4 4 .83%、长白仔猪感染的血清阳性率为 6 4 .2 8% ,明显高于大约克和杜洛克种猪和仔猪的感染率。 PCV2感染的血清阳性率高的种猪和仔猪群 ,其 PRRSV和 Pr V的抗体阳性率低。这些结果说明 ,PCV2在猪群中的感染非常普遍 ,不同品种猪对 PCV2的易感性不同 ,PCV2的感染可降低猪群对疫苗的免疫应答 相似文献