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《中国预防兽医学报》2017,(8)
为对猪链球菌(SS)病的防控提供参考依据,本研究对广东地区养殖场健康猪群采集的455份样品,屠宰场采集的243份样品和疑似SS发病猪群采集的228份样品进行了SS携带情况统计分析。结果显示,健康猪群、屠宰场屠宰猪群及发病猪群SS的阳性率分别为42.20%(192/455)、32.10%(78/243)及82.02%(187/228)。血清型定型结果显示,健康猪群共检测到17个血清型,主要以2型和29型为主,分别占18.83%(29/154)和14.94%(23/154),其次为16型,占6.50%(10/154),未定型菌株占31.82%;发病猪群共检测到11个血清型,主要以2型(16.58%)、3型(9.63%)和7型(6.95%)为主,其次为9型(5.34%),未定型菌株占48.66%。对比发现健康猪群和发病猪群携带SS的血清型有所差异,可为临床SS病的预防防控提供参考依据。 相似文献
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《中国兽医学报》2017,(6):1092-1097
为了解广州周边地区健康猪群猪链球菌(Streptococcus suis,SS)的携带情况,本研究于2014-2015年在广州周边地区共采集488份屠宰猪群扁桃体样品和健康猪群鼻拭子样品,SS分离鉴定发现有165份样品为SS 16S rRNA阳性,共分离到68株SS菌株,对所分离的菌株进行血清型分型和3个常用毒力标记基因mrp,epf,sly的检测分析。结果显示:所采集样品SS的阳性率为33.81%(165/488),其中哺乳仔猪的鼻拭子样品的携带率最高68%(34/50),母猪次之为49.15%(29/59);对分离的68株SS进行血清型定型,定型率为73.52%(50/68),主要分布于16型,2型(1/2型),29型等16个血清型中;毒力基因在本批菌株中分布较少。本研究为监控广州周边地区SS的流行情况提供了试验参考数据。 相似文献
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应用多重PCR检测屠宰猪扁桃体中的猪链球菌 总被引：3，自引：0，他引：3
从广东省部分地区肉联厂采集屠宰猪扁桃体401份,用两个多重PCR检测样品中猪链球菌（SS）及其主要致病血清型。检出SS阳性样品154份（38．4％）,其中69份（17．2％）携带SS2,35份（8．7％）携带SS9,而SS7和SS1分别为9份（2．2％）和3份（0．7％）。不同血清型SS菌株可混合感染同一头猪,但比例均小于5％。在地区分布上,粤西地区SS阳性率（18．3％）明显低于其他地区（p〈0．01）,其余各地区之间均无显著差异（p〉0．05）,在35％～70％之间。对全部样品进行细菌分离,共分离到SS53株,分离率为13．21％;其中SS225株（6．23％）,SS93株（0．75％）,SS71株（0．25％）,未定型SS24株（5．99％）,细菌分离的阳性率远比PCR检测结果要低。此检测结果证实了华南地区猪群中广泛存在SS,并呈多个血清型混合感染,而且流行呈地域性的特点,凸显了SS流行的复杂性。 相似文献
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为探明2016年广西猪群主要疫病的感染情况,从发病猪场和屠宰场共采集猪组织样品340份,应用RT-PCR方法检测猪瘟病毒（CSFV）?猪繁殖与呼吸综合征病毒（PRRSV）、猪流行性腹泻病毒（PEDV）,应用PCR方法检测猪圆环病毒2型（PCV2）和猪伪狂犬病病毒（PRV）?结果显示,发病猪场中的CSFV、PRRSV、PEDV、PCV2和PRV感染率分别为1.97%?16.45%?0.00%?34.21%和3.95%,而屠宰场猪的感染率分别为0.53%?11.17%?0.00%?43.09%和0.00%?对猪群的混合感染情况进行分析发现,PCV2和其它病原的混合感染率最高?其中,发病猪场二重感染率最高的为“CSFV+PCV2”,为3.95%;其次为“PRRSV+PCV2”,为3.29%?屠宰场二重感染率最高的是“PRRSV+PCV2”,为2.66%?结果表明：临床健康屠宰猪群和发病猪群中的PCV2和PRRSV感染率较高,其中PCV2感染率最高,且常与CSFV和PRRSV发生混合感染;PRV和CSFV主要在发病猪中被检出;加强PCV2和PRV的监控,对控制猪群发病具有重要意义;应通过加强生物安全措施来净化PRRSV和PRV? 相似文献
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为探明2014年广西猪群主要疫病的感染情况,本研究从发病猪场和屠宰场采集猪组织样品共325份,应用RT-PCR方法检测猪瘟病毒(CSFV)、猪繁殖与呼吸综合征病毒(PRRSV)、猪流行性腹泻病毒(PEDV),并应用PCR方法检测猪圆环病毒2型(PCV2)和猪伪狂犬病病毒(PRV)。结果发现,发病猪场中,这5种病毒感染率分别为12.00%、28.57%、19.43%、53.71%和9.71%,而屠宰场的感染率分别为5.33%、2.67%、5.33%、59.33%和11.33%。对猪群混合感染情况分析发现,PCV2和其他病原的混合感染率最高。其中,发病猪场二重感染最高的为PRRSV+PCV2,达到11.43%,其次为PEDV+PCV2、CSFV+PCV2和PCV2+PRV,阳性率分别为5.71%、4.00%和4.00%;三重感染率最高的为PRRSV+PEDV+PCV2以及PRRSV+PCV2+PRV,阳性率均为2.29%。屠宰场二重感染最高的是PCV2+PRV,达到3.33%;三重感染最高的是CSFV+PCV2+PRV,阳性率为0.67%。结果表明,在发病猪场和屠宰场中,PCV2的感染率最高,且常与其他病原发生混合感染,PRV感染率呈上升趋势,加强对这2种病毒的监控对控制广西地区猪群发病具有重要意义。 相似文献
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塞尼卡病毒(Senecavirus A,SVA)是最近新出现的可引起猪水泡样病变的单股小RNA病毒。为了解SVA的流行状况,采集对2016—2018年从我国辽宁等省份猪群的164份病料和2018年从我国福建等7省份35个屠宰场的458份组织混合样品和95份血清样品,用荧光实时定量RT-PCR方法进行SVA检测和分析。结果显示:在2016年的48份样品中,从3个省份检测出7份阳性样品,阳性率为14.6%。2017年的32份病料中,从5个省份检测出7份阳性样品,占比为21.9%;2018年的84份病料中,从3个省份检测出19份阳性样品,占比为22.6%。屠宰场组织样品中,从6个省份检出55份SVA阳性样品,阳性率为12.0%;血清样品中,从1个省份检出7份阳性样品,阳性率为7.4%。结果表明,我国猪群SVA感染年份至少可追溯到2016年;SVA在我国流行面相对较广,且猪群中存在隐性带毒,因此须重视猪群的SVA监视和监测。 相似文献
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为了解屠宰环节猪群猪链球菌2型感染及环境污染情况,评估屠宰环节猪链球菌2型传播风险,在广东省东莞市所有的10个生猪屠宰场采集570份猪扁桃体、1 200份环境拭子样品,以及120份猪胴体和120份猪内脏表面拭子样品,采用荧光PCR方法进行猪链球菌2型核酸检测。结果显示:猪扁桃体样品的猪链球菌2型阳性率为0.88%;屠宰环境拭子样品的阳性率为3.17%,其中待宰区为3.50%,屠宰区为8.50%,分割区为4.00%,屠宰工具为3.00%;在车间出入口的猪胴体和猪内脏表面拭子样品中检出猪链球菌2型阳性,其中猪胴体阳性率为0.83%,猪内脏阳性率为4.17%。结果表明,东莞市屠宰场猪群中存在猪链球菌2型感染,猪群携带的病原对屠宰加工环境以及屠宰加工产品可造成不同程度的污染。因而屠宰场存在传播猪链球菌2型的风险,需要加强对屠宰场环境及屠宰用具的清洗消毒以及相关职业人群的自身防护教育。 相似文献
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为了了解云南省玉溪市猪群感染猪捷申病的初步情况,试验采用商品化猪捷申病毒(PTV)抗原诊断试剂盒对玉溪市红塔区、通海县和元江县3个县区采集的455份猪血清样品(其中红塔区278份,通海县87份,元江县90份;散养户或规模化猪场317份,屠宰场138份,母猪205份,公猪250份)进行检测。结果表明:在455份血清样品中,375份为阳性,总阳性率为82.42%。其中红塔区猪捷申病阳性率为88.13%,通海县为65.52%,元江县为81.11%;散养户或规模化猪场阳性率为82.97%;屠宰场为81.16%;母猪阳性率为82.44%,公猪阳性率为77.20%。说明玉溪市猪群广泛存在PTV感染,该地区需要加强对猪捷申病的监测和防控。 相似文献
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为了解上海地区种猪场猪群猪链球菌流行情况、血清型分布情况,于2020年5月,从上海8家规模化种猪场采集猪口液样品148份,开展猪链球菌监测及血清型分型研究.86份检测口液样品猪链球菌阳性,阳性率58.11％.86株猪链球菌分离株中,49株鉴定为传统血清型,血清型鉴定率56.98％;共鉴定出12种血清型,其中优势血清型为... 相似文献
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To investigate the epidemics of Streptococcus suis in Guangdong province, 228 samples from infected pigs,and 698 samples from healthy pigs including 243 samples from tonsils of slaughtered pigs and 455 nasal swabs of healthy pigs were analyzed.The results showed that the positive rate of Streptococcus suis of infected,healthy and slaughtered pigs were 82.02%(187/228),42.20%(192/455) and 32.10%(78/243),respectively.187 strains of Streptococcus suis were isolated from infected pigs and serotyped in 11 serotypes,including serotype SS1,SS2,SS3,SS4,SS7,SS8,SS9,SS16,SS19,SS29 and SS31, in which serotype SS2(16.58%),SS3(9.63%) and SS19 (7.49%) were dominant,flowed by SS7(6.95%)and SS9(5.34%),and 48.66% strains were non-typabled.Meanwhile,154 strains of Streptococcus suis from healthy swine(including farms and slaughter houses) were classified into 17 serotypes,including serotype SS2,SS3,SS4,SS5,SS7,SS8,SS9,SS10,SS12,SS15,SS16,SS17,SS19,SS21,SS23,SS29 and SS30,in which SS2(18.83%) and SS29(14.94%)were dominant,flowed by SS16(6.50%) and 31.82% strains were non-typabled. 相似文献
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为了探明2018年3月江苏省某规模化猪场发病猪的病原,本研究对发病猪进行采样和细菌分离,并对细菌进行了PCR鉴定、多位点序列分型(MLST)及小鼠致病力分析。结果发现:在该场4份发病猪组织中分离到猪链球菌2型(SS2)、猪链球菌9型(SS9)菌株各2株,MLST分析显示分离的SS2菌株属于ST7,SS9菌株属于ST243,SS2、SS9分离菌株的毒力基因表现型分别为mrp^+epf^+sly^+orf2^+sao^+fbps^+gdh^+和mrp^-epf^-sly^-orf2^+sao^-fbps^+gdh^+。动物试验显示其中3株猪链球菌分离菌株对BALB/c小鼠有较强致病力。研究结果为该养殖场猪链球菌感染防控措施的制定提供了重要参考。 相似文献
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Y Kataoka M Haritani M Mori M Kishima C Sugimoto M Nakazawa K Yamamoto 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1991,53(6):1043-1049
Five inbred strains of mice were tested for their susceptibility to Streptococcus suis type 2 including the type strain, two isolates from meningitis in pigs and two isolates from tonsils of clinically healthy pigs. C57BL/6, ICR and ddY strain mice showed lower susceptibility to all strains of S. suis type 2 than BALB/c and SS strain mice. The type strain and the isolates from diseased pigs produced septicaemia and meningitis in BALB/c and SS mice inoculated with 10(8) colony forming unit of the bacteria and 60 to 100% of these infected mice died. On the other hand, mice inoculated with the isolates from healthy pigs showed mild clinical signs but none of them died. In BALB/c mice which died or developed nervous signs, the purulent meningo-encephalitis, myocarditis, ophthalmitis, labyrinthitis and otitis media were observed. S. suis type 2 antigen was demonstrated in these lesions by immunoperoxidase staining using rabbit S. suis type 2 antiserum. These results were similar to those in the experimentally infected pigs with these virulent and avirulent strains against mice. These results indicate that BALB/c and SS strains of mice are useful as an experimental model of S. suis type 2 infections in pigs, and that there are virulent and avirulent strains against mice and pigs among the strains of S. suis type 2. 相似文献
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猪链球菌是猪的一种重要病原菌,并且也会引起人的链球菌病。有35个荚膜血清型(1/21、~34),通常自发病或死亡猪体分离获得1,2,7,9型和14型菌株,其中2型是毒力最强的血清型。根据已知猪链球菌16 SrRNA及溶血素(sly)、谷氨酸脱氢酶(gdh)、荚膜多糖(cps)、胞壁蛋白或溶菌酶释放相关蛋白(mrp)、胞外因子(epf)编码基因序列设计特异性引物,建立猪链球菌群和1(14),2(1/2),7型和9型特异性PCR或多重PCR,建立2型致病性菌株和1型高致病性菌株毒力鉴定PCR或多重PCR,用于检测和鉴别临床病料和细菌分离物中的猪链球菌,具有高敏感性和高特异性,与其他致病菌及其他血清的猪链球菌型无交叉反应,为疫病诊断及流行病学的研究提供了快速、简便和有用的工具。 相似文献
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为探究广西部分地区猪链球菌(Streptococcus suis,SS)流行菌株主要血清型及毒力因子分布情况。本试验于2018年1月至2018年6月对从多个猪场采集到的116份疑似链球菌感染的组织病料(脑、肺脏、淋巴结等)进行病原菌检测,采用细菌分离鉴定、形态学观察及PCR扩增等方法对病原菌及其血清型和部分毒力因子进行鉴定。结果显示,116份样品共分离到链球菌32株,阳性率为27.59%(32/116),其血清型主要以SS2和SS9为主,分离率分别为40.63%(13/32)和43.75%(14/32),其他血清型为15.63%(5/32);毒力因子检测结果表明:SLY、MRP、EPF以及SBP2′因子的检出率分别为:81.25%(26/32)、59.38%(19/32)、50.00%(16/32)和71.88%(23/32)。32株链球菌中以SLY^+MRP^+EPF^+SBP2′^+(13株)、SLY^+MRP^-EPF^-SBP2′^-(5株)、SLY^+MRP^+EPF^-SBP2′^+(5株)为主要的毒力基因型,其中SS2均能检测出3个或3个以上的毒力因子。玉林、柳州市主要分布SS9型,南宁、百色市主要分布SS2型;广西不同地区毒力因子的分布情况存在差异且不同血清型或同一血清型的链球菌毒力因子的分布情况也各不相同,其中SS2携带的毒力因子检出率明显高于其他血清型。该研究可为今后猪链球菌疫苗及致病机理研究提供理论依据,为广西地区猪场链球菌血清型疫苗选择提供指导。 相似文献
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Luque I Tarradas C Astorga R Perea A Wisselink HJ Vecht U 《Research in veterinary science》1999,66(1):69-72
A total of 142 strains from different serotypes of Streptococcus suis isolated in Spain from diseased pigs (88 strains) and healthy carrier pigs (54 strains) were studied for the presence of a muramidase released protein (MRP) and an extracellular factor (EF). The following five phenotypes: MRP+EF+, MRP+EF-, MRP-EF+, MRP+EF* and MRP*EF- were detected. A high percentage of S. suis serotype 2 strains isolated from diseased pigs (84 per cent) belonged to phenotype MRP+EF+, but this phenotype has also been noticed in other serotypes (serotypes 1, 1/2 and 14). Both proteins were detected in S. suis serotype 2 strains (26%) isolated from healthy carrier pigs and one of both proteins in serotypes 1 and 14 (phenotype MRP+EF*). The isolation of S. suis strains from healthy pigs which have shown both proteins may support the epidemiological significance of these carriers in the maintenance, transmission and distribution of virulent strains within and between swine farms. 相似文献
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Tarradas C Luque I de Andrés D Abdel-Aziz Shahein YE Pons P González F Borge C Perea A 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2001,48(5):347-355
Two cases of meningitis due to Streptococcus suis in humans are reported here. A butcher and an abattoir worker were referred to a health centre in Castellón (Spain) with fever and symptoms of meningitis. After adequate treatment, a slight hipoacusia persisted as sequelae in both cases. Colonies of S. suis group R, serotype 2 and phenotype MRP+EF+ were isolated from cerebroespinal fluid. Epidemiological studies showed that both workers had in common the handling of pork meat of slaughtered healthy pigs from three closed farms. A study of the tonsils from apparently healthy, slaughtered pigs was carried out. A total of 234 tonsillar samples were obtained and 81 strains of S. suis were isolated from them. Serotype 2 appeared to be the most frequent (50.6%), and the analysis for phenotype showed a high percentage of tonsillar strains with the phenotype MRP+EF+ (35.9%). The humans and 28 tonsillar swine strains showed a similar profile (S. suis group R, serotype 2 and phenotype MRP+EF+). A total of 26 of the swine isolates were analysed by ribotyping using EcoRI. The human strains showed the same six-band hybridization pattern that shared five bands with the pattern most frequently shown by most of the tonsillar N. suis group R, serotype 2 and phenotype MRP+EF+ strains, differing only in the lightest, faintest band which was slightly less anodical in human (> or = 1.8 kb) than in swine (approximately 1.8 kb). From these results, both groups of strains, humans and porcine, showed differences; how can these differences in the pattern of ribotyping be explained if they should have the same origin? Is it possible that they have undergone an adaptation to the new host or perhaps the modification is due to other unknown causes? Further studies in this area are required in order to answer these questions. 相似文献