期刊文献+
共找到492篇文章
< 1 2 25 >
每页显示 20 50 100
The dose regimen formulation of doxycycline hydrochloride and florfenicol injection based on ex vivo pharmacokinetic-pharmacodynamic modeling against the Actinobacillus pleuropneumoniae in pigs
1
作者 Yuanyuan Yuan Boyu An +6 位作者 Shuyu Xie Wei Qu Haihong Hao Lingli Huang Wanhe Luo Jixiang Liang Dapeng Peng 《Animal Diseases》 CAS 2023年第4期286-298,共13页
Doxycycline hydrochloride and florfenicol combination(DoxHcl&FF)is an effective treatment for respiratory diseases.In the study,our objective Was to evaluate the activity of DoxHcl&FF against Actinobacillus pl... Doxycycline hydrochloride and florfenicol combination(DoxHcl&FF)is an effective treatment for respiratory diseases.In the study,our objective Was to evaluate the activity of DoxHcl&FF against Actinobacillus pleuropneumoniae(APP)in porcine pulmonary epithelial lining fluid(PELF)and the optimal dosage scheme to avoid the development of resistance.The DoxHcl&FF Was administered intramuscularly(IM)at 20mg/kg,and the PELF was collected at differ-ent time points.The minimum inhibitory concentration(MIC)and time-mortality curves were also included in the study.Based on the sigmoid Emax equation and dose equations,the study integrated the in vivo pharmacokinetic data of infected pigs and ex vivo pharmacodynamic data to obtain the area under concentration time curve(AUCo-24h)MIC values in PELF and achieve bacteriostatic activity,bactericidal activity and the virtual eradication of bacteria.The study showed that the combination of DoxHcl and FF caused no significant changes in PK parameters.The peak concentration(Cmax)of FF in healthy and diseased pigs was 8.87±0.08 and 8.67±0.07μg/mL,the_AUCo-24h were.172.75±2.52 and 18022±3.13 h-μg/mL,the Cmax of DoxHcl was 7.91±0.09 and 7.99±0.05μg/mL,and the AUCo-24h was 129.96±3.70 h-μg/mL and 169.82±4.38 h-μg/mL.DoxHcl&FF showed strong concentra-tion-dependent tendencies.The bacteriostatic,bactericidal,and elimination activity were calculated as 5.61,18.83 and 32.68 h,and the doses were 1.37(bacteriostatic),4.59(bactericidal)and 7.99(elimination)mg/kg.These findings indicated that the calculated recommended dose could assist in achieving more precise administration,increasing the effectiveness of DoxHcl&FF treatment for APP infections. 展开更多
关键词 FLORFENICOL Doxycycline hydrochloride PK-PD PIG Dose regimen Actinobacillus pleuropneumoniae
下载PDF
2010—2021年甘肃省山羊传染性胸膜肺炎流行病学调查分析
2
作者 康新华 韩庆彦 +2 位作者 毋艳萍 柴刚 王亮 《中国兽医杂志》 CAS 北大核心 2024年第9期47-55,共9页
为了解甘肃省山羊传染性胸膜肺炎(CCPP)的流行情况,本试验采用流行病学调查方法对全省2010—2021年羊群CCPP的发病情况进行了调查,并从地区、物种、季节、性别、年龄、养殖规模、疫点类型和是否采取治疗措施方面对数据进行了统计分析。... 为了解甘肃省山羊传染性胸膜肺炎(CCPP)的流行情况,本试验采用流行病学调查方法对全省2010—2021年羊群CCPP的发病情况进行了调查,并从地区、物种、季节、性别、年龄、养殖规模、疫点类型和是否采取治疗措施方面对数据进行了统计分析。调查结果显示,2010—2021年全省CCPP平均发病率为8.15%(11 077/135 860),病死率为29.49%(3 267/11 077),CCPP发病率与物种、季节、年龄和是否采取治疗措施有关。山羊CCPP发病率(9.79%,9 038/92 306)极显著高于绵羊(4.68%,2 039/43 554)(P<0.01);冬季发病率(10.62%,8 129/76 548)极显著高于夏季(4.43%,1 979/44 715)(P<0.01);幼龄羊发病率(5.58%,1 899/34 060)极显著低于成年羊(9.02%,9 178/101 800)(P<0.01);有既往发病史的老疫点CCPP发病率和病死率均低于首次发病的新疫点,且治愈率更高;采取治疗措施羊只的CCPP发病率和病死率均低于未采取治疗措施羊只;不同性别和养殖规模的CCPP发病率均无显著差异(P>0.05),CCPP的发病也无明显地域性。结果表明,CCPP在甘肃省普遍流行,山羊比绵羊更易感,在年龄较大、寒冷季节和缺乏治疗的情况下发病率增加。因此,养殖场户应当针对风险因素制定预防策略,并通过采取定期调查监测、预防接种和治疗等措施,降低CCPP在甘肃省的发病率。 展开更多
关键词 山羊传染性胸膜肺炎(CCPP) 流行病学调查 分析 甘肃省
下载PDF
牛支原体和丝状支原体丝状亚种双重TaqMan荧光定量PCR检测方法的建立与应用 被引量:3
3
作者 马芷忻 武琪 +2 位作者 刘桐 辛九庆 徐青元 《中国预防兽医学报》 CAS CSCD 北大核心 2024年第3期262-268,共7页
牛传染性胸膜肺炎和牛支原体病均为重要的牛传染病,两者均可致牛出现呼吸系统症状,临床上难以区分。为建立鉴别诊断牛传染性胸膜肺炎和牛支原体病的双重Taq Man荧光定量PCR检测方法,本研究根据这两种病的病原丝状支原体丝状亚种和牛支... 牛传染性胸膜肺炎和牛支原体病均为重要的牛传染病,两者均可致牛出现呼吸系统症状,临床上难以区分。为建立鉴别诊断牛传染性胸膜肺炎和牛支原体病的双重Taq Man荧光定量PCR检测方法,本研究根据这两种病的病原丝状支原体丝状亚种和牛支原体的基因组保守区域(丝状支原体丝状亚种nt826-nt1742,牛支原体nt189-nt618)分别设计引物与探针,通过优化反应体系与反应条件,建立同时检测这两种病原的Taq Man荧光定量PCR检测方法。特异性试验结果显示,该方法仅对丝状支原体丝状亚种模拟样品和牛支原体检测结果为阳性,而巴氏杆菌、牛传染性鼻气管炎病毒、无乳支原体、山羊支原体山羊肺炎亚种、丝状支原体山羊亚种、关节炎支原体Leachii株检测结果均为阴性,特异性较强。分别以1.0×10~7拷贝/μL~1.0×10~1拷贝/μL的p EASY-Mmm和p EASY-Mb质粒标准品为模板,进行敏感性试验,结果显示,该方法对丝状支原体丝状亚种和牛支原体重组质粒标准品的检测限均为1.0×10~1拷贝/μL,敏感性较高。对不同浓度质粒标准品混合物的重复性试验结果显示,组内与组间重复性试验变异系数均小于2.5%,重复性较好。利用该方法对112份临床样品(104份鼻拭子、8份肺组织样品)检测,结果显示,丝状支原体丝状亚种检测结果和已发表PCR方法检测结果一致,均为阴性,而本实验建立的方法检测出4份牛支原体阳性样品,且经测序证实检出样品为真实阳性样品,而已发表的多重PCR方法检测该病原结果均为阴性。本研究建立了能够同时检测丝状支原体丝状亚种和牛支原体的双重Taq Man荧光定量PCR方法,其特异性强、敏感性高、重复性好,可用于各种临床样品的检测,为这两种病原的快速检测和流行病学调查提供了技术手段。 展开更多
关键词 牛传染性胸膜肺炎 牛支原体 TaqMan荧光定量PCR
下载PDF
Epidemiological Investigation of Actinobacillus Pleuropneumoniae in Western Shandong 被引量:4
4
作者 徐公义 王海丽 葛长城 《Agricultural Science & Technology》 CAS 2009年第4期141-145,共5页
[ Objective ] The aim of this study was to investigate the epidemic status of porcine pleuropneumonia in western Shandong and establish the PCR method of actinobacillus pleuropneumoniae (APP). [ Method] The epidemic... [ Objective ] The aim of this study was to investigate the epidemic status of porcine pleuropneumonia in western Shandong and establish the PCR method of actinobacillus pleuropneumoniae (APP). [ Method] The epidemic status of APP in lesion tissues of 186 death pigs and 545 health pigs without clinical symptoms was analyzed by PCR method. [ Result] APP positive rate in 186 samples accounted for 43.0% (80/186), while that in 545 porcine serums accounted for 9.4% (51/545). [ Conclusion] This PCR method can be used as one of the important means for APP clinical diagnosis. 展开更多
关键词 Actinobacillus pleuropneumoniae PCR DETECTION
下载PDF
陕西西安阎良区及毗邻区域奶山羊传染性胸膜肺炎横断面调查和风险因素分析 被引量:2
5
作者 董钊 李忠军 +9 位作者 张涛 王玉梅 陈峰 杨厚安 朱琳 张飞 尤鹏飞 崔忠华 张璞 何勇君 《中国兽医杂志》 CAS 北大核心 2024年第1期72-78,共7页
为掌握陕西省西安市阎良区及毗邻区域奶山羊传染性胸膜肺炎的流行情况,分析影响该病传播的风险因素,本调查采用二阶段概率抽样方法抽取阎良区全区以及毗邻的临潼区和高陵区的未免疫该病疫苗的血清样品,应用酶联免疫吸附试验进行传染性... 为掌握陕西省西安市阎良区及毗邻区域奶山羊传染性胸膜肺炎的流行情况,分析影响该病传播的风险因素,本调查采用二阶段概率抽样方法抽取阎良区全区以及毗邻的临潼区和高陵区的未免疫该病疫苗的血清样品,应用酶联免疫吸附试验进行传染性胸膜肺炎抗体检测。结果显示,该区域群表观流行率(HAP)为25.32%,群真实流行率(HTP)为23.41%(14.07%~32.74%);个体表观流行率(AP)为10.46%(8.81%~12.31%)。风险因素分析显示,“中大规模场点”和“病羊未采取隔离、治疗”是羊传染性胸膜肺炎传播的主要风险因素。结果表明,该区域存在一定程度的羊传染性胸膜肺炎流行,养殖场点需要对患病羊及时隔离治疗或淘汰,有条件的场点实施羊传染性胸膜肺炎检测与净化;在饲养规模上升的同时要加强生物安全管理水平,减少潜在风险因素的传播机会。 展开更多
关键词 奶山羊 传染性胸膜肺炎 风险因素 横断面调查 血清流行率
下载PDF
胸膜肺炎放线杆菌利用肠菌素摄取铁促生长的研究
6
作者 焦晓丽 崔一芳 +6 位作者 申学阳 时晨欣 武金亮 郭芳芳 崔国林 刘娜 徐福洲 《动物医学进展》 北大核心 2024年第8期15-21,共7页
肠菌素(Ent)介导的铁摄取系统在病原细菌生长和定植过程中发挥关键作用。胸膜肺炎放线杆菌是引起猪传染性胸膜肺炎的病原,为鉴定该菌不同血清型菌株能否利用肠菌素摄取铁发挥促生长作用,试验选用胸膜肺炎放线杆菌血清1~12型参考菌株,首... 肠菌素(Ent)介导的铁摄取系统在病原细菌生长和定植过程中发挥关键作用。胸膜肺炎放线杆菌是引起猪传染性胸膜肺炎的病原,为鉴定该菌不同血清型菌株能否利用肠菌素摄取铁发挥促生长作用,试验选用胸膜肺炎放线杆菌血清1~12型参考菌株,首先在限铁条件下通过肠菌素促生长试验鉴定不同血清型菌株能否利用肠菌素;进而通过添加不同浓度的铁螯合剂DFO、细菌接种量、肠菌素等因子,筛选胸膜肺炎放线杆菌利用肠菌素促生长的最适培养条件;最后分别在限铁和富铁培养条件下通过生长曲线鉴定肠菌素对胸膜肺炎放线杆菌12个血清型菌株的促生长作用。结果显示,在测定的胸膜肺炎放线杆菌血清1~12型参考菌株中,除血清2型和10型外,其他型菌株在限铁条件下均可利用肠菌素促生长。不同因子筛选结果显示,最适细菌接种浓度为1×10^(4)CFU/mL,添加DFO浓度为20μmol/L,而添加0.4、2.0、10.0μg/mL等不同浓度的肠菌素对胸膜肺炎放线杆菌均有显著促生长作用,且随肠菌素浓度升高而促生长能力显著增强。试验证实胸膜肺炎放线杆菌可利用肠菌素促进其生长,同时证实不同血清型利用肠菌素方面存在显著差异,为解析肠菌素介导的铁摄取系统在胸膜肺炎放线杆菌中的作用机制奠定了基础。 展开更多
关键词 胸膜肺炎放线杆菌 血清型 肠菌素 促生长
下载PDF
猪传染性胸膜肺炎发病机制研究进展
7
作者 黄麒霖 仇正英 +3 位作者 王贵波 景小涵 李维 辛蕊华 《黑龙江畜牧兽医》 CAS 北大核心 2024年第3期31-37,共7页
猪传染性胸膜肺炎(porcine pleuropneumonia,PCP)是由猪胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)引起的一种严重呼吸道疾病,在全世界广泛流行。APP主要通过直接接触、气溶胶和污染物在猪群之间传播,猪只感染后,多种毒力... 猪传染性胸膜肺炎(porcine pleuropneumonia,PCP)是由猪胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)引起的一种严重呼吸道疾病,在全世界广泛流行。APP主要通过直接接触、气溶胶和污染物在猪群之间传播,猪只感染后,多种毒力因子触发一系列细胞因子级联反应,引发“炎症风暴”造成脓毒血症,导致肺脏病变及坏死,最急性型的死亡率可达80%~100%。PCP在我国的发病率呈逐年上升趋势,已成为危害养猪业最严重的疾病之一,给我国养殖业造成严重的经济损失。临床上常用抗生素治疗PCP,但由于细菌耐药性日益严重,使得抗生素对该病的防控愈发困难。此外APP血清型较多,不同类型血清型之间交叉免疫不强,导致疫苗防控效果不理想,感染后死亡率和发病率均处于上升趋势。目前,人们对APP发病机制的研究主要集中在毒力因子方面,关于该菌的侵袭过程(如细菌的定植和营养获取、逃避宿主防御、诱导组织损伤等)对PCP的发生、发展及预后的影响尚不清楚。因此,文章主要综述了PCP的发病机制,揭示了多种因素的作用,以期了解APP的感染过程及机体的免疫机制,在抗炎和增强免疫力等环节为防治PCP提供理论依据。 展开更多
关键词 胸膜肺炎放线杆菌(APP) 猪传染性胸膜肺炎(PCP) 动物传染病 发病机制 毒力因子
下载PDF
柚皮苷可通过多种途径修复猪胸膜肺炎放线杆菌诱导的小鼠肺上皮屏障损伤
8
作者 黄麒霖 刘晨 +5 位作者 景晓涵 黄丽娜 潘香逸 石雄伟 仇正英 辛蕊华 《畜牧兽医学报》 CAS CSCD 北大核心 2024年第11期5299-5309,共11页
旨在研究柚皮苷(naringin,NAR)对猪胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)感染引起小鼠肺上皮屏障损伤的防治效果。将40只6~8周龄的雄性昆明小鼠随机分为5组,分别为对照组、模型组、NAR低剂量组、NAR中剂量组以及NAR... 旨在研究柚皮苷(naringin,NAR)对猪胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)感染引起小鼠肺上皮屏障损伤的防治效果。将40只6~8周龄的雄性昆明小鼠随机分为5组,分别为对照组、模型组、NAR低剂量组、NAR中剂量组以及NAR高剂量组。连续灌胃给药8 d,空白组和模型组给予生理盐水。在第7天,小鼠以气管插管灌注的方式感染APP(1×10^(8)CFU·mL^(-1),100μL·只^(-1)),空白组灌注等体积无菌生理盐水,各组小鼠于造模后48 h处死,采样并评估NAR的防治作用。通过X射线图像表明,NAR可降低小鼠肺泡灌洗液中APP载菌量,并且能够缓解肺部病理损伤;此外,NAR干预后,可逆转由于APP诱导的小鼠肺组织中ZO-1、Occludin-1和Claudin-1紧密连接蛋白的表达降低,从而促进肺上皮屏障修复。为进一步探讨NAR促进肺上皮屏障修复的机制,研究发现NAR不仅减少小鼠肺组织中促炎因子IL-6和TNF-α的分泌,还增加了抑炎因子IL^(-1)0表达,同时能够增加抗氧化酶SOD2和Hmox1表达,表明NAR能够增强机体抗炎及抗氧化能力;此外,NAR可抑制TGF-β1/Smad2/3通路,减少由APP诱导的肺纤维组织增生;通过分析凋亡相关关键蛋白和Tunel荧光标记发现,NAR可呈剂量依赖性的减少细胞凋亡。综上所述,NAR可通过抗炎、抗氧化、抗纤维化和抗凋亡等途径,修复小鼠肺上皮屏障损伤,从而有效逆转APP诱导的肺部炎症损伤、发挥防治APP的功效。 展开更多
关键词 天然药物 柚皮苷 猪胸膜肺炎放线杆菌 肺上皮屏障损伤
下载PDF
Establishment of an Indirect ELISA with the Major Epitope Domain of ApxⅡ of Actinobacillus pleuropneumoniae Expressed in Prokaryotic Cells
9
作者 吴东 倪艳秀 +1 位作者 何孔旺 李郁 《Agricultural Science & Technology》 CAS 2014年第1期13-16,38,共5页
[Objective] This study aimed to develop an indirect ELISA to detect the antibodies against Actinobacil us pleuropneumoniae (APP) using the recombinant ApxⅡA1 protein expressed in prokaryotic cells as the antigen. [... [Objective] This study aimed to develop an indirect ELISA to detect the antibodies against Actinobacil us pleuropneumoniae (APP) using the recombinant ApxⅡA1 protein expressed in prokaryotic cells as the antigen. [Method] The major epi-tope domain of ApxⅡ was cloned into the prokaryotic expression vector pET-28a (+) to obtain the recombinant plasmid pET-ApxⅡA1, which was then transformed into E. coli BL21 (DE3) for expression. The immunogenicity of the recombinant pro-tein was analyzed by western-blotting. After that, the purified recombinant protein was used as the coating antigen in the indirect ELISA for detecting the antibodies against APP. Final y, the concentration of coated antigen and the dilution of serum were optimized. [Result] Proved by enzyme digestion and sequencing, the recombi-nant plasmid pET-ApxⅡA1 was constructed successful y. The recombinant protein was highly expressed in prokaryotic cells, and Western-blotting analysis showed that it was recognized specifical y by positive serum of APP. The indirect ELISA could detect the antibody against APP with the purified recombinant protein as the coating antigen. The optimal concentration of coated antigen was 1.23 μg/ml and the opti-mal dilution of serum was 1:100. Compared with a commercial ELISA kit detecting antibody against ApxⅣ, the coincidence rate of the indirect ELISA was 90.4%. [Conclusion] Our results indicated that the indirect ELISA is sensitive and specific, and suitable for evaluating the effect of APP vaccine and epidemiological surveys. 展开更多
关键词 Actinobacillus pleuropneumoniae Major epitope of Apx Prokaryoticexpression Protein purification ELISA
下载PDF
胸膜肺炎放线杆菌ApxⅠ蛋白单克隆抗体制备和抗原表位初步鉴定
10
作者 蔡金双 耿琰 +3 位作者 张宝戈 车巧林 丁文傒 李玉峰 《畜牧与兽医》 CAS 北大核心 2024年第5期119-126,共8页
为了制备胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)Ⅰ型ApxⅠ毒素(ApxⅠ)AI2蛋白特异性单克隆抗体,进而建立用于评估亚单位疫苗免疫效果的阻断ELISA方法,以实验室前期筛选得到的ApxⅠ抗原优势决定簇AI2重组蛋白为免疫原,... 为了制备胸膜肺炎放线杆菌(Actinobacillus pleuropneumoniae,APP)Ⅰ型ApxⅠ毒素(ApxⅠ)AI2蛋白特异性单克隆抗体,进而建立用于评估亚单位疫苗免疫效果的阻断ELISA方法,以实验室前期筛选得到的ApxⅠ抗原优势决定簇AI2重组蛋白为免疫原,免疫6周龄BALB/c雌鼠。利用常规细胞融合和间接ELISA筛选阳性杂交瘤细胞,获得4株单克隆抗体,命名为2C2、4E4、5E7和6F2,上清液效价分别为1∶6400、1∶6400、1∶12800和1∶6400。ELISA与Western blot结果表明,制备的4株单克隆抗体均与重组AI2蛋白有良好的反应性。其中5E7可与APP天然ApxⅠ毒素蛋白特异性结合,同时4株单克隆抗体均不与多杀性巴氏杆菌、支气管败血波氏菌、猪丹毒丝菌、副猪格拉菌和猪链球菌2型反应。亚类分型结果表明,2C2、4E4、5E7属于IgG1亚类,6F2属IgG2a亚类,4株单抗轻链均为κ链。通过构建AI2重组蛋白截短体,初步确定线性表位在74~93 aa之间。本研究成功制备了4株针对AI2蛋白单克隆抗体,为APP亚单位疫苗免疫效果评估方法的建立奠定了基础。 展开更多
关键词 胸膜肺炎放线杆菌 AI2蛋白 单克隆抗体 抗原表位
下载PDF
Sero-Prevalence and Risk factors of Contagious Bovine Pleuropneumonia (CBPP) in Afgoye District Lower Shabelle Region, Somalia
11
作者 Ahmed Mohamed Ahmed Sumaya Hassan Ali +7 位作者 Abdisalam Mohamed Ali Abdirazack Saleban Osman Binti Abubakar Mohamed Abdifatah Mohamud Ibar Shafii Abdullahi Mohamed Mohamed Abdelrahman Mohamed Ahmed Ali Omar Zakaria Ibrahim Issack 《Open Journal of Veterinary Medicine》 CAS 2024年第2期11-20,共10页
Contagious bovine Pleuropneumonia (CBPP) is an infectious and highly contagious respiratory disease of cattle and water buffalo, caused by the Mycoplasma mycoides subspecies mycoides. It induces significant economic l... Contagious bovine Pleuropneumonia (CBPP) is an infectious and highly contagious respiratory disease of cattle and water buffalo, caused by the Mycoplasma mycoides subspecies mycoides. It induces significant economic losses and leads to a severe livestock production problem, negatively influencing people’s livelihoods of affected countries. In Somalia, there is no updated data on the prevalence and distribution of the disease. Hence, a descriptive cross-sectional study was conducted from September 2022 to June 2023 in different villages under the Afgoye District of lower Shabelle region, Somalia. The main purpose of this study is to assess the sero-prevalence and identify the associated risk factors for the occurrence of the disease. In this study, villages, age, sex, breed, and body condition were considered as risk factors. A total of 90 blood samples were collected and tested in the laboratory using the Anti-CBPP Elisa kit test. Out of 90 serum samples from herd cattle, 32 were positive, resulting in an overall prevalence of 35.5%. In addition, we found a statistically significant variation between the prevalence of the disease and factors such as sex, age, body condition and breeds. In summary, the overall prevalence of Contagious bovine pleuropneumonia in this study area is worth to be considered because there is a low quality of health care and less awareness of the Contagious bovine Pleuropneumonia effects on herds, which warrants the official authorities to act and follow appropriate preventive and control measures to reduce the incidence of the disease and generate appropriate controlling and prevention measures in all regions of Somalia. 展开更多
关键词 Contagious Bovine Pleuropneumonia SERO-PREVALENCE CATTLE SOMALIA MYCOPLASMA Cross Sectional Study
下载PDF
“饲料禁抗”后规模猪场猪传染性胸膜肺炎的血清学调查和分析
12
作者 高梦丽 廖荣莉 +5 位作者 李贺 柳泰 卿任科 唐红剑 郑金 余兴龙 《中国兽医杂志》 CAS 北大核心 2024年第10期48-54,共7页
为了解“饲料禁抗”后规模猪场中猪传染性胸膜肺炎放线杆菌(APP)的流行情况,本试验于2021―2023年在16个未免疫疫苗的APP阳性规模猪场采集不同生产阶段猪群的2286份血清样本,应用间接ELISA进行抗体检测。结果显示:(1)16个规模猪场血清... 为了解“饲料禁抗”后规模猪场中猪传染性胸膜肺炎放线杆菌(APP)的流行情况,本试验于2021―2023年在16个未免疫疫苗的APP阳性规模猪场采集不同生产阶段猪群的2286份血清样本,应用间接ELISA进行抗体检测。结果显示:(1)16个规模猪场血清样本的APP抗体总阳性率为61.2%(1399/2286),高于文献报道的“饲料禁抗”前猪群阳性率(20%~53%);(2)在不同生产阶段的猪群中,母猪APP抗体阳性率最高(92.4%,545/590),其次为哺乳期仔猪(87.6%,227/259),而后从高到低依次是育肥后期、保育期和育肥中期猪群,APP抗体阳性率分别为63.6%(361/568)、43.7%(129/295)和35.3%(122/346),育肥早期猪群的APP抗体阳性率最低,为6.6%(15/228);(3)初产母猪的APP抗体阳性率(73.8%)明显低于其他胎次母猪(96.3%~97.4%);(4)猪只的APP母源抗体随着日龄的增长而下降,基本在90日龄时降到最低,此后猪群因APP感染而导致APP抗体水平和阳性率均开始缓慢上升,到肥猪出栏前仍一直上升。结果表明,饲养密度增加和推迟肥猪出栏是导致规模猪场APP感染大幅上升的重要因素。 展开更多
关键词 猪传染性胸膜肺炎 饲料禁抗 规模猪场 血清学调查
下载PDF
四组中药组方治疗绵羊传染性胸膜肺炎效果观察 被引量:1
13
作者 陈福斌 周青山 +1 位作者 蔡梅芳 许奎 《畜牧兽医杂志》 2024年第2期8-10,共3页
羊传染性胸膜肺炎又称羊支原体性肺炎,由支原体所引起的一种高度接触性传染病,其临床特征为高热,咳嗽,胸和胸膜发生浆液性和纤维素性炎症,主要危害1~3月龄的羔羊,常呈急性和慢性经过,病死率较高,是绵羊养殖中较为常见的呼吸道疾病。临... 羊传染性胸膜肺炎又称羊支原体性肺炎,由支原体所引起的一种高度接触性传染病,其临床特征为高热,咳嗽,胸和胸膜发生浆液性和纤维素性炎症,主要危害1~3月龄的羔羊,常呈急性和慢性经过,病死率较高,是绵羊养殖中较为常见的呼吸道疾病。临床上大多采用抗生素进行治疗,但常常发生耐药情况而导致疗效差的情况。近年来,我们采用早期应用中草药辅以较为敏感的抗生素进行治疗,取得了良好的治疗效果。本文就对常用的4组中药组方开展疗效观察,筛选出了一组疗效最佳的中药组方,以期为临床治疗提供解决方案。 展开更多
关键词 中药 绵羊传染性胸膜肺炎 疗效观察
下载PDF
Identification and Detection of Actinobacillus pleuropneumoniae in Infected and Subclinically Infected Pigs by Multiplex PCR Based on the Genes ApxIVA and OmlA 被引量:8
14
作者 XIAO Guo-sheng CAO San-jie DUAN Li-li WEN Xin-tian MA Xiao-ping CHEN Hua-mei 《Agricultural Sciences in China》 CAS CSCD 2006年第2期146-154,共9页
PCRs based on different genes of Actinobacillus pleuropneumoniae have been developed for detecting and identifying A. pleuropneumoniae. Some of them could amplify positive fragments from the phylogenetically closely r... PCRs based on different genes of Actinobacillus pleuropneumoniae have been developed for detecting and identifying A. pleuropneumoniae. Some of them could amplify positive fragments from the phylogenetically closely related species bacteria. To improve veracity and specificity of PCR, a species-specific multiplex PCR assay was developed to identify and detect A. pleuropneumoniae, based on the 3'-terminus of the species-specific apxlVA gene and the already existing species-specific primers in the omlA gene. Both 346-bp and 950-bp fragments could be simultaneously amplified from all A. pleuropneumoniae reference strains and isolates, and the species specificity of the assay was evaluated with a collection of ten strains representing eight different species bacteria including species normally found in the respiratory tracts of swine. All of these strains turned out negative in the multiplex PCR. All sequences of products of multiplex PCR randomly sampled were also correct. The sensitivity of the multiplex PCR was determined to be 10 pg of A. pleuropneumoniae DNA. The multiplex PCR and bacterial isolation were compared to determine their sensitivities by using experimentally infected pigs and clinical disease pigs. The multiplex PCR was more sensitive than bacterial isolation. The multiplex PCR was also evaluated on mixed bacterial cultures from clinical healthy pigs. 26/100 (26%) of the subclinically infected pigs were detected from clinical healthy pigs. The results indicate that the multiplex PCR assay is a sensitive, highly specific, and effective diagnostic tool for identification and detection of A. pleuropneumoniae. 展开更多
关键词 multiplex PCR Actinobacillus pleuropneumoniae pig bacteria apxIVA and omlA genes
下载PDF
Development of Multiplex-PCR for Identification of Pasteurella multocida,Haemophilus parasuis and Actinbacillus pleuropneumoniae 被引量:2
15
作者 HE Ying,ZHAO Ping,CHU Yue-feng,GAO Peng-cheng,LU Zhong-xin Lanzhou Veterinary Research Institute,Chinese Academy of Agricultural Sciences State Key Laboratory of Veterinary Etiological Biology +1 位作者 Key laboratory of Grazing Animal Diseases of Ministry of Agriculture Key Laboratory of Animal Virology of Ministry of Agriculture,Lanzhou 730046,China 《Animal Husbandry and Feed Science》 CAS 2010年第8期25-27,共3页
[ Objective] To develop multiplex-PCR for diagnosis of mixed infection caused by Pasteurella multocida ( PM), Haomophilus parasuis (HPS) and Actinbaci/lus pleuropneumoniae (App). [ Method ] PCR method was develo... [ Objective] To develop multiplex-PCR for diagnosis of mixed infection caused by Pasteurella multocida ( PM), Haomophilus parasuis (HPS) and Actinbaci/lus pleuropneumoniae (App). [ Method ] PCR method was developed to detect single infection caused by PM, HPS or App. The conditions of amplification and primers were optimized, and the multiple-PCR was developed to detect mixed infection of PM, HPS and App. [ Result] A 457-bp band, a 821-bp band and a 342-bp band were simultaneously amplified in the one PCR reaction system. The method had high sensitivity and specificity. [ Conduslon] The multiple-PCR is successfully developed and can be used for differential diagnosis of PM, HPS and App. 展开更多
关键词 Haemophilus parasuis Pasteurella multocida Actinbacillus pleuropneumoniae MULTIPLEX-PCR
下载PDF
Cloning, Expression of apxl Gene of Actinobacillus pleuropneumoniae and Development of ELISA 被引量:1
16
作者 LIU Jian-jie, HE Qi-gai, CHEN Huan-chun, WU Bin, XU Xiao-juan, LIU Jun-fa, TANG Xian-chun and BEI Wei-chengCollege of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070 , P.R. China 《Agricultural Sciences in China》 CAS CSCD 2003年第5期578-582,共5页
Based on the published nucleotide sequence of the apxICA of Actinobacillus pleuropneumoniae in Genbank(S4074), a pair of primers were designed. A 3 640 bp(4 687 - 8 326 bp)gene fragment was amplified by PCR from the i... Based on the published nucleotide sequence of the apxICA of Actinobacillus pleuropneumoniae in Genbank(S4074), a pair of primers were designed. A 3 640 bp(4 687 - 8 326 bp)gene fragment was amplified by PCR from the isolated strain of A. pleuropneumoniae serovar 1. Then, it was cloned into pMD18-T, identified by both restriction endonuclease and sequence analysis, and inserted into pET-28a expression vector to yield the expression plasmid. SDS-PAGE result indicated expression of apxICA in BL21 (DE3), Western blot analysis showed the protein's immunogenicity. Using the expressed protein, ELISA was established to detect serum antibody against ApxI. The feature of ELISA to detect highly virulent A. pleuropneumoniae strains infection was proved by primary clinical application. 展开更多
关键词 Actinobacillus pleuropneumoniae apxICA gene CLONING Prokaryotic expression ELISA
下载PDF
Presence of <i>Actinobacillus pleuropneumoniae, Streptococcus suis, Pasteurella multocida, Bordetella bronchiseptica, Haemophilus parasuis and Mycoplasma hyopneumoniae</i>in upper respiratory tract of swine in farms from Aguascalientes, Mexico 被引量:1
17
作者 Abraham Loera-Muro Francisco J. Avelar-González +2 位作者 Víctor M. Loera-Muro Mario Jacques Alma L. Guerrero-Barrera 《Open Journal of Animal Sciences》 2013年第2期132-137,共6页
Respiratory diseases are one of the most important health problems in pig herds. The porcine respiratory disease complex (PRDC) is the term used to describe pneumonic diseases caused by multiple infectious agents that... Respiratory diseases are one of the most important health problems in pig herds. The porcine respiratory disease complex (PRDC) is the term used to describe pneumonic diseases caused by multiple infectious agents that provoke weight loss in animals or death. In the PRDC multiple pathogens (bacteria and/or viruses) work in combination to induce this respiratory disease. Within this complex, Actinobacillus pleuropneumoniae, Streptococcus suis, Pasteurella multocida, Bordetella bronchiseptica, Haemophilus parasuis and Mycoplasma hyopneumoniae are the main bacterial pathogens involved in great economic losses to the swine industry. The aim of this work was to estimate the presence of A. pleuropneumoniae, S. suis, P. multocida, B. bronchiseptica, H. parasuis and M. hyopneumoniae in the upper respiratory tract of pigs in representative swine farms inAguascalientes,Mexico, using PCR technique. The study was performed in 14 swine farms. We obtained a total of 212 nasal swabs. Near 20% of samples were positive for A. pleuropneumoniae (located in the 79% of farms);17% were positive for S. suis (in 86% of farms), of these, 3% were S. suis serovar 2;30% were positive for H. parasuis (93% of farms);23% of the samples to P. multocida (in 79% of farms);and 19% to M. hyopneumoniae (in 64% of farms). B. bronchiseptica was not detected in this study. The results obtained show that bacterial pathogens of PRDC were present in the upper respiratory tract of pigs in all farms studied;therefore, these pathogens are widely disseminated in pig farms of Aguascalientes, Mexico. 展开更多
关键词 Porcine Respiratory Disease Complex ACTINOBACILLUS pleuropneumoniae Streptococcus SUIS PASTEURELLA multocida BORDETELLA bronchiseptica HAEMOPHILUS parasuis Mycoplasma hyopneumoniae
下载PDF
ArcA Gene Expression Level of Actinobacillus pleuropneumoniae in Anaerobic Culture
18
作者 DUAN Li-li WEN Xin-tian +1 位作者 CAO San-jie HUANG Xiao-bo 《畜牧兽医学报》 CAS CSCD 北大核心 2009年第S1期34-38,共5页
In the present study,mRNA levels of the ArcA gene of Actinobacillus pleuropneumoniae serotype1 were measured during response to stress by growing under anaerobic conditions.Expression levels were measured by semi-quan... In the present study,mRNA levels of the ArcA gene of Actinobacillus pleuropneumoniae serotype1 were measured during response to stress by growing under anaerobic conditions.Expression levels were measured by semi-quantitative RT-PCR using the housekeeping gene recF as an internal standard.The expression of ArcA was undetectable until about 3 hours under standard culture conditions,but it was promptly and highly expressed in anaerobic culture.The results are consistent with ArcA being a potential virulence gene of Actinobacillus pleuropneumoniae,and likely playing an important role in pathogenesis caused by this organism. 展开更多
关键词 SEMI-QUANTITATIVE RT-PCR ACTINOBACILLUS pleuropneumoniae ARCA gene ANAEROBIC stress
下载PDF
Study on Formation and Inhibition Mechanism of Biofilm of Pig Actinobacillus pleuropneumoniae
19
作者 Yanfei LIU Jiande YANG 《Agricultural Biotechnology》 CAS 2019年第2期119-121,148,共4页
Pig Actinobacillus pleuropneumoniae(App) could induce chronic respiratory tract infection in pigs, which causes major economic losses on pig industry. Bacterial biofilm(BBF) is bacterial community adsorbed on the surf... Pig Actinobacillus pleuropneumoniae(App) could induce chronic respiratory tract infection in pigs, which causes major economic losses on pig industry. Bacterial biofilm(BBF) is bacterial community adsorbed on the surface of biomaterials or body cavity, to protect bacteria escape, and recurrent outbreaks of related infectious diseases and chronic infections resulting therefrom are called bacterial biofilm diseases. App BF belongs to polymers with spatial structure in vitro, and its formation is regulated by multiple genes. Among them, gene deletion of the key component TolC of multidrug efflux pumps and type I secretion systems causes that App BF adhesion weakens; gene deletion of catalytic core ClpP of Clp proteolytic complex induces the inhibition of BF formation; outer membrane lipoprotein VacJ of App promotes BF formation; gene deletion of active enzyme LuxS enhances the formation of App BF and decreases bacterial adhesion ability; gene deletion of Adh obviously declines bacterial accumulation, BF formation and adhesion to host cells. In this paper, BF formation or inhibition mechanism in App is elaborated from molecular level, which could provide reference basis for exploring the prevention of its biofilm diseases. 展开更多
关键词 PIG A. pleuropneumoniae BIOFILM (BF) Gene REGULATION FORMATION mechanism INHIBITION
下载PDF
Genetic Evolution Analysis of Actinobacillus pleuropneumoniae
20
作者 Yu LIANG Yanfei LIU Jiande YANG 《Agricultural Biotechnology》 CAS 2019年第2期113-115,118,共4页
In order to explore the genetic evolution of Actinobacillus pleuropneumoniae(App) in different countries and clarify the relationships among different App in each region, the 16 S rRNA gene of App in the NCBI nucleoti... In order to explore the genetic evolution of Actinobacillus pleuropneumoniae(App) in different countries and clarify the relationships among different App in each region, the 16 S rRNA gene of App in the NCBI nucleotide database was analyzed and compared by the bioinformatics method. The phylogenetic tree was constructed after tailoring alignment. The results showed that a stable genetic phenomenon was indicated in the evolutionary process of App. The isolates derived from China were clustered and showed a high degree of conservation. They had a certain genetic relationship with the British and American strains, but had far relationship with the strains from Japan which was a neighboring country of China. The isolates from different countries in the Eurasian continent shared high homology. The isolates of the two regions originated from common ancestors. 展开更多
关键词 ACTINOBACILLUS pleuropneumoniae GENETIC evolution PHYLOGENETIC TREE HOMOLOGY comparison ORIGIN Relationship
下载PDF
上一页 1 2 25 下一页 到第
使用帮助 返回顶部