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1.
《中国预防兽医学报》2015,(9)
为了解华南地区猪场猪流感病毒(SIV)和甲型H1N1/2009流感病毒(H1N1pdm09)的流行情况,本研究采用血凝抑制试验(HI),对2013年~2014年从5个省份采集的2 208份血清样品进行SIV和H1N1pdm09流感病毒血清学检测,结果显示阳性血清共1 269份(57.42%),其中广东省和广西省的感染率最高(p0.01)。H1N1SIV、H3N2 SIV和H1N1pdm09流感病毒抗体阳性率分别为22.51%、32.97%和26.49%。H1N1pdm09流感病毒的抗体几何平均滴度(GMT)最高(91.93±1.04,p0.05)。H1N1 SIV和H3N2 SIV在冬季血清阳性率最高,然而在冬末(2月)阳性率却最低(p0.01)。H1N1pdm09流感病毒抗体阳性率在5月和9月出现高峰(p0.01)。母猪的H1N1SIV和H1N1pdm09流感病毒抗体阳性率高于仔猪和育肥猪,但仔猪的H3N2 SIV抗体阳性率却比较高。本研究为华南地区猪场SIV和H1N1pdm09流感病毒的预防提供参考依据。 相似文献
2.
为了解猪流感病毒(SIV)在我国的流行情况,本研究对2011年～2012年从不同省市重点地区屠宰场、规模化猪场和个体养殖户采集猪血清样品13044份,以经典H1N1 (CS)、类禽H1N1 (EA)、甲型H1N1(pdm/09)、H3N2、H5N1、H9N2亚型SIV抗原并采用血凝抑制(HI)方法检测.结果显示,2011年～2012年我国猪血清中类禽H1N1亚型SIV抗体平均阳性率比其他亚型高,分别为42.24％和45.89％,2011年甲型H1N1亚型SIV血清抗体平均滴度(GMT)比其他亚型高,GMT为53.32,2012年经典H1N1 GMT比其他亚型高,GMT为73.2.结果表明2011年～2012年我国猪群中H1N1亚型SIV感染较为普遍. 相似文献
3.
我国部分省份猪群中流感病毒血清学抗体的调查 总被引：1，自引：0，他引：1
《中国预防兽医学报》2016,(1)
为了解近年来我国猪群中流感病毒的感染与流行情况,本研究分别对2013年11~12月期间采集于福建等9个重点养猪省份的2 198份以及2014年3~4月期间采自于广东和湖南两省的3 654份猪血清样品进行了血凝抑制(HI)抗体的检测。选取欧亚类禽型猪H1N1(EA H1N1)、2009甲型H1N1(2009/H1N1)、H3N2亚型猪流感病毒(SIV)、H5N1禽流感病毒(AIV)、H9N2 AIV及H7N9流感病毒制备的HI标准抗原作为检测抗原。结果显示,2013年我国猪群中EA H1N1、2009/H1N1、H3N2 SIV、H5N1 AIV、H9N2 AIV及H7N9流感病毒平均抗体阳性率分别为49.73%、11.87%、1.71%、0、0、1.36%;2014年分别为48.52%、12.10%、1.04%、0、0、2.05%。检测结果表明2013年~2014年间我国猪群中H1N1亚型SIV感染比较普遍,H3N2、H9N2流感病毒抗体阳性率较低,未检测到H5N1、H7N9流感病毒抗体。 相似文献
4.
《中国兽医杂志》2018,(2)
目前,全球范围内流行的猪流感病毒亚型主要有3种:H1N1、H3N2、H1N2,此外,H1N7、H4N6、H9N2、H5N1、H3N3、H3N1和H2N3等亚型病毒也在猪体内分离到,但没有证据显示这些病毒在猪体内建立稳定的谱系。为了解我国屠宰场猪群中流感病毒的感染与流行情况,选取2009年甲型H1N1(pdm/09)、欧洲类禽H1N1(EA H1)、经典H1N1(经典H1)、新型三源重排H1N1(ReH1)、H3N2(H3)、H9N2(H9)流感病毒制备的血凝抑制(HI)标准抗原作为检测抗原,对全国25个屠宰场的猪血清进行了HI抗体的检测。结果显示,2016年我国屠宰场样品中,pdm/09、EA H1、经典H1、Re H1、H3、H9抗体阳性率分别为23.18%、28.12%、19.34%、24.97%、7%、7.41%;在所监测地区中,华南地区屠宰场猪流感血清平均抗体阳性率最高。结果表明,2016年我国屠宰场猪群中H1N1亚型猪流感病毒感染比较普遍,H3N2和H9N2亚型猪流感病毒抗体阳性率较低。 相似文献
5.
感染猪群的流感病毒（swine influenza virus,SIV）对养猪业和公共卫生均构成一定威胁。对H1N1亚型SIV监测发现,经典猪H1N1(classical swine H1N1,CS H1N1)、欧亚类禽H1N1(Eurasian avian-like H1N1,EA H1N1)、人源H1N1和2009年大流行H1N1(2009 pandemic H1N1,pdm/09 H1N1)亚型流感病毒均在我国猪群内传播,并且这些SIV相互间不断发生基因重组。一些H1N1亚型SIV会偶发性引起人类感染,对公共卫生存在潜在威胁。此外,H1N1亚型SIV还会引发犬和水貂等动物的感染。经动物模型试验发现,不同H1N1亚型SIV在小鼠、鸡、猪和雪貂中的致病性及传播能力不同,其中一些SIV分离株显示出致死性,需要对其进行生物学特征研究,评估其对人类的潜在风险。SIV导致的猪死亡率不高,因而对其关注较少。但是禽源和哺乳动物源流感病毒可以在猪体内重组为可引起人类大流行的流感病毒毒株,因此应该及时了解SIV的流行情况与生物学特性,并做好相应的控制措施,以减少经济损失,避免具有大流行潜力毒株出现。... 相似文献
6.
《中国兽医学报》2017,(2):266-271
为了解广东地区猪流感病毒(SIV)的流行和变异情况,本研究于2013年10月至2014年1月从广东省4个不同地区采集猪鼻拭子和肺脏病料共203份,对样品处理之后进行鸡胚分离和RT-PCR检测,从中分离得到5株SIV,对其进行病毒纯化、全基因组测序和遗传进化分析。结果表明,5株SIV分离毒株其中3株为H1N1亚型,2株为H1N2。分离毒株HA裂解位点位于PSIQSR↓GL,具有典型的低致病性流感病毒特征。HA基因序列比对结果显示,5株SIV分离毒株与A/Jiangsu/ALS1/2011(H1N1)株同源性最高,核苷酸相似性为97%~99%。遗传进化分析结果显示,5株分离毒株的PB2、PB1、PA和NP基因片段属于PDM/09分支,M基因片段以及外部基因片段HA属于欧亚类禽分支,NS基因片段属于北美三元重组分支,3株H1N1亚型的NA基因属于欧亚类禽分支,2株H1N2亚型的NA基因属于人季节性流感分支。抗原位点分析结果表明,分离毒株的抗原位点基本保守,但YJ28分离株HA1蛋白上发现3个氨基酸突变,分别是L69S、S137P、E222G。本研究通过对广东省不同地区分离到的SIV进行鉴定分析,掌握SIV的变异趋势,为猪流感的防控提供切实有效的理论依据。 相似文献
7.
《动物医学进展》2021,42(3)
在2009年甲型H1N1流感(H1N1 pdm09)大流行暴发初期,该病毒就已经成功地潜入到了猪群当中,继而参与到了猪流感病毒(SIV)的进化过程,通过不断地重配和适应,促进了新型SIV变异毒株的产生。目前,世界各地的猪群中普遍流行着携带有H1N1 pdm09基因片段的新型SIV,其重配形式呈现多样化。值得一提的是,由于H1N1 pdm09毒株的内部基因具有广泛的基因相容性,不同亚型、不同谱系的人源流感病毒、禽源流感病毒和本地猪流感病毒更倾向与它们优先发生重组。重配后的子代病毒较亲本毒株容易获得选择优势,能够在猪群中建立稳定的遗传谱系。研究发现H1N1 pdm09部分独特的内部基因片段在其高效的人际间传播过程中发挥着决定性的作用。一旦这类新型SIV成功突破种间屏障,获得适应新的哺乳动物的能力,将会对人类健康造成潜在的威胁。论文综述了携带有H1N1 pdm09基因的新型重配SIV的分子流行情况,特别就H1N1 pdm09内部基因与重组病毒致病性、传播能力等相关的分子基础进行了系统地综述,为防控新型SIV的暴发和保障公共卫生安全提供依据。 相似文献
8.
广东省部分地区规模化猪场猪流感病毒感染的血清学调查与分析 总被引：1，自引：0，他引：1
为了解广东省规模化猪场猪流感病毒(SIV)感染情况,本研究采用ELISA方法和血凝抑制试验(HI),对2011年～2012年采集的1 050份血清样品进行SIV血清学检测.两种检测方法结果显示1 050份血清样品中SIV抗体阳性率分别为50.4％(ELISA)和50.2％(HI).其中珠三角地区和粤东地区的感染率高于粤西地区.SIV亚型调查结果显示该地区流行的SIV主要为H1和H3亚型,抗体阳性率分别为39.2％和18.2％(ELISA).部分猪场存在H9亚型SIV抗体.部分猪群中同时存在H1和H3两种亚型SIV抗体,表明猪群中存在不同亚型SIV混合感染.本研究为广东省猪流感的预防提供参考依据. 相似文献
9.
《中国兽医学报》2017,(10)
为了解江西省猪流感病毒的流行情况,通过血凝抑制试验(Hemagglutination Inhibition Test,HAI),我们检测了2012年至2015年间收集的2 005份血清样品中的H1和H3亚型流感病毒的抗体。结果显示,江西省猪群血清中的H1和H3亚型流感病毒的血清抗体阳性率分别为34.76%(697/2005,95%CI 32.68%~36.89%)和23.69%(475/2005,21.84%~25.61%),H1和H3亚型流感病毒共感染的阳性率为6.78%(136/2005,5.72%~7.97%)。通过对不同分支流感病毒的血清抗体阳性率统计分析后发现,江西省内不同地区内流感病毒呈现明显的地域性流行,并且2012年以来,全省pdm/09的血清抗体阳性率由36.74%(32.18%~41.50%)下降到20.44%(17.14%~24.06%),H3亚型的流感病毒抗体阳性率由4.85%(1.59%~10.97%)上升到41.24%(37.08%~45.49%),江西省猪群中流行的主要分支发生变化。本研究为江西省流感病毒的监测与预防提供了全面的数据支持。 相似文献
10.
为了对供港猪群中的猪流感流行情况进行分析,从华南地区供港猪群中用无菌棉拭子采集鼻腔粘液样品,采用鸡胚接种方法,从供港猪群中分离出了2株不同亚型的猪流感病毒株,经国家流感中心鉴定分别为H1N1和H3N2亚型。本研究设计了猪流感常见亚型的HA和NA分型特异性引物,建立了猪流感型特异性RT-PCR检测方法;对分离鉴定的2株猪流感病毒和禽流感H5N1 HI检测抗原进行了RT-PCR检测,并对其部分HA和NA基因进行克隆测序分析。对供港猪群的血清检测结果表明:供港猪群中H1N1和H3N2亚型抗体阳性率分别为26.87%、38.26%,禽流感H5N1和H9N2亚型抗体阳性率均为0%。 相似文献
11.
对2009年H1N1甲型流感流行前后的上海地区养殖场户410份猪血清样品,分别采用血凝抑制试验（hemagglutination inhibition,HI）和酶联免疫吸附试验（enzyme-linked immunosorbent assay,ELISA）进行检测H1N1甲型流感病毒和猪流感病毒（Swine in？uenza virus,SIV）。检测结果表明,除2007年外,2008~2010年猪血清中均存在不同水平的HI抗体,阳性率呈显著上升趋势,且抗体水平与猪群饲养周期及饲养密度正相关,而与猪流感病毒的流行无相关性。 相似文献
12.
Maldonado J Van Reeth K Riera P Sitjà M Saubi N Espuña E Artigas C 《Veterinary journal (London, England : 1997)》2006,172(2):377-381
This paper reports on a serological and virological survey for swine influenza virus (SIV) in densely populated pig areas in Spain. The survey was undertaken to examine whether the H1N2 SIV subtype circulates in pigs in these areas, as in other European regions. Six hundred sow sera from 100 unvaccinated breeding herds across Northern and Eastern Spain were examined using haemagglutination inhibition (HI) tests against H1N1, H3N2 and H1N2 SIV subtypes. Additionally, 225 lung samples from pigs with respiratory problems were examined for the presence of SIV by virus isolation in embryonated chicken eggs and by a commercial membrane immunoassay. The virus isolates were further identified by HI and RT-PCR followed by partial cDNA sequencing. The HI test on sera revealed the presence of antibodies against at least one of the SIV subtypes in 83% of the herds and in 76.3% of the animals studied. Of the 600 sow sera tested, 109 (18.2%), 60 (10%) and 41 (6.8%) had SIV antibodies to subtype H1N2 alone, H3N2 alone and H1N1 alone, respectively. Twelve H3N2 viruses, 9 H1N1 viruses and 1 H1N2 virus were isolated from the lungs of pigs with respiratory problems. The analysis of a 436 nucleotide sequence of the neuraminidase gene from the H1N2 strain isolated further confirmed its identity. Demonstrably, swine influenza is still endemic in the studied swine population and a new subtype, the H1N2, may be becoming established and involved in clinical outbreaks of the disease in Spain. 相似文献
13.
Swine influenza virus (SIV) of H1N1 and H3N2 subtypes are dominated in European pigs population. "Classical swine" H1N1 subtype was replaced by "avian-like" H1N1 subtype. It co-circulates with H3N2 reassortant possessing "avian" genes. In the present study, 41 SIV strains isolated from pigs with pneumonia, raised in 20 Polish farms, were identified and characterised. Since it was evidenced that isolates from the same geographic district and the same year of isolation are in 100% similar, 15 strains representing different district and different year of isolation were chosen to construct phylogenetic trees. Two genes, conservative matrix 1 (M1) and the most variable, haemagglutynin (HA), were sequenced and subjected into phylogenetic analysis. The results of the analysis confirmed that "avian-like" swine H1N1 strains evolved faster than classical SIV strains. HA gene of these isolates have been derived from contemporary strains of "avian-like" SIV. In contrast, the M1 gene segment may have originated from avian influenza viruses. H3N2 strain is located in swine cluster, in the main prevalent European group of H3N2 isolates called A/Port Chalmers/1/73-like Eurasian swine H3N2 lineage, which has evolved separately from the human H3N2 virus lineage around 1973. 相似文献
14.
Dana Skibbe En-Min Zhou Bruce H Janke 《Journal of veterinary diagnostic investigation》2004,16(1):86-89
A commercial indirect swine influenza virus (SIV) H1N1 enzyme-linked immunosorbent assay (ELISA) was compared with the hemagglutination inhibition (HI) assay by testing 72 samples from experimentally infected pigs and 780 field samples of undefined SIV status. The HI assay was performed using SIV isolates A/Swine/IA/73 for H1N1 and A/Swine/IA/8548-1/98 for H3N2. The ELISA used an SIV isolated in 1988. The results showed that HI and ELISA detected an antibody in 11 and 6, respectively, of 72 serum samples collected from pigs experimentally infected with a 1992 SIV isolate (A/Swine/IA/40776/92). The presence of antibodies in these experimental samples was confirmed by HI tests in which all 72 samples were positive against the homologous virus, a more recent H1N1 SIV isolate (A/Swine/NVSL/01) supplied by National Veterinary Services Laboratories, Ames, Iowa, and a 1999 H1N1 isolate currently used in a commercial vaccine. On testing 780 field samples, an overall agreement of 85.5% was generated between the HI and ELISA. This study demonstrated that the ELISA is a useful serodiagnostic screening test at herd level for detecting swine antibodies against SIV. However, a new SIV isolate representing current SIV strains circulating in the field is needed to replace the older isolates used in the HI and ELISA to increase the test accuracy for serodiagnosis of SIV. 相似文献
15.
旨在了解河南省猪流感病毒的流行情况及其遗传进化和基因组特征。2018年4月，从河南省某一出现疑似流感症状猪群中采集鼻拭子样品150份用于分离病毒，对分离病毒的全基因组进行序列测定和分析。同时感染6周龄BALB/c小鼠，研究其对小鼠的致病性。结果显示，获得1株H1N1亚型病毒[命名为A/swine/Henan/NY20/2018（H1N1）]。遗传进化表明，其HA和NA基因属于欧亚类禽H1N1分支，PB2、PB1、PA、NP和M基因属于2009甲型H1N1分支，NS基因属于经典H1N1分支。HA蛋白的裂解位点序列为PSIQSR↓GL，具有低致病性流感病毒的分子特征，在小鼠肺和鼻甲有效复制并能引起肺组织病理学变化。本研究分离到1株3源重排H1N1亚型病毒，对小鼠呈现一定致病力，提示应进一步加强对SIV的监测。 相似文献
16.
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
17.
Detection of Novel Reassortant Influenza A (H3N2) and H1N1 2009 Pandemic Viruses in Swine in Hanoi,Vietnam 下载免费PDF全文
下载免费PDF全文 T. D. Dao N. T. Pham B. J. Cowling M. Peyre M. Peiris 《Zoonoses and public health》2015,62(6):429-434
From May to September 2013, monthly samples were collected from swine in a Vietnamese slaughterhouse for influenza virus isolation and serological testing. A(H1N1)pdm09 viruses and a novel H3N2 originating from reassortment between A(H1N1)pdm09 and novel viruses of the North American triple reassortant lineage were isolated. Serological results showed low seroprevalence for the novel H3N2 virus and higher seroprevalence for A(H1N1)pdm09 viruses. In addition, serology suggested that other swine influenza viruses are also circulating in Vietnamese swine. 相似文献
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Tiina Nokireki Taina Laine Laura London Niina Ikonen Anita Huovilainen 《Acta veterinaria Scandinavica》2013,55(1):69
Background
Swine influenza is an infectious acute respiratory disease of pigs caused by influenza A virus. We investigated the time of entry of swine influenza into the Finnish pig population. We also describe the molecular detection of two types of influenza A (H1N1) viruses in porcine samples submitted in 2009 and 2010.This retrospective study was based on three categories of samples: blood samples collected for disease monitoring from pigs at major slaughterhouses from 2007 to 2009; blood samples from pigs in farms with a special health status taken in 2008 and 2009; and diagnostic blood samples from pigs in farms with clinical signs of respiratory disease in 2008 and 2009. The blood samples were tested for influenza A antibodies with an antibody ELISA. Positive samples were further analyzed for H1N1, H3N2, and H1N2 antibodies with a hemagglutination inhibition test. Diagnostic samples for virus detection were subjected to influenza A M-gene-specific real-time RT-PCR and to pandemic influenza A H1N1-specific real-time RT-PCR. Positive samples were further analyzed with RT-PCRs designed for this purpose, and the PCR products were sequenced and sequences analyzed phylogenetically.Results
In the blood samples from pigs in special health class farms producing replacement animals and in diagnostic blood samples, the first serologically positive samples originated from the period July–August 2008. In samples collected for disease monitoring, < 0.1%, 0% and 16% were positive for antibodies against influenza A H1N1 in the HI test in 2007, 2008, and 2009, respectively. Swine influenza A virus of avian-like H1N1 was first detected in diagnostic samples in February 2009. In 2009 and 2010, the avian-like H1N1 virus was detected on 12 and two farms, respectively. The pandemic H1N1 virus (A(H1N1)pdm09) was detected on one pig farm in 2009 and on two farms in 2010.Conclusions
Based on our study, swine influenza of avian-like H1N1 virus was introduced into the Finnish pig population in 2008 and A(H1N1)pdm09 virus in 2009. The source of avian-like H1N1 infection could not be determined. Cases of pandemic H1N1 in pigs coincided with the period when the A(H1N1)pdm09 virus was spread in humans in Finland. 相似文献20.
一株欧洲类禽H1N1猪流感病毒的分离鉴定与反向遗传系统的建立 总被引：1，自引：0，他引：1
猪流感是猪常见的呼吸道传染病,临床以高热、呼吸困难、咳嗽和衰竭、迅速康复或死亡为特征。猪流感不仅给养猪业造成巨大损失,也严重威胁着人类健康。本研究从发病猪场中分离到1株H1N1亚型猪流感病毒,序列分析结果显示,分离毒株属于欧洲类禽猪流感H1N1亚型病毒。将分离毒株分别接种到MDCK与ST细胞,观察病毒的生长特性,结果显示分离的猪流感病毒在ST细胞中复制能力较强。采用RT-PCR技术分别扩增8个基因片段,克隆到流感病毒反向遗传系统,成功拯救出猪流感病毒毒株,测序结果显示拯救的猪流感病毒与亲本毒序列一致。本研究成功分离的猪流感病毒,以及建立的反向遗传技术为研究欧洲类禽猪流感病毒跨种传播的机制以及研发新型猪流感疫苗株奠定了基础。 相似文献