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弓形虫（Toxoplasma gondii）是一种人畜共患机会性致病原虫，其急性感染可导致宿主产生明显的临床症状和严重的病理损伤。弓形虫致密颗粒蛋白1（dense granuleprotein 1，GRA1）是一种良好的诊断抗原，也是弓形虫急性感染的标志物循环抗原（circulating antigen，CAg）的重要组分。本研究利用TgGRA1单克隆抗体建立双抗体夹心ELISA方法，为急性弓形虫感染的检测提供依据。将免疫GRA1-His的小鼠脾细胞与SP2/0进行融合，筛选出能稳定分泌抗体的杂交瘤细胞。选择其中一种单抗与HRP标记后的鼠源GRA1多抗配对，建立1种双抗体夹心ELISA方法，检测人工感染弓形虫的猪和小鼠血清样品，并将检测效果与巢式PCR（nest PCR，nPCR）和商品化试剂盒进行比较。结果筛选到4株杂交瘤细胞，腹水效价为106~107，亚型均为IgG1；IFA和Western blot结果显示，4株单抗均具有良好的反应性和特异性。选择1G2单抗和HRP标记多抗配对，建立了循环抗原双抗体夹心ELISA方法，最低能够检测到血清中1.563 ng·mL-1 GRA1抗原，或者100 ng·mL-1 ESA。该方法与nPCR相比具有较高的一致性，较市售商品化试剂盒更为准确可靠。本研究第1次将GRA1抗原作为急性弓形虫感染的诊断指标，建立相应的检测方法，成功地在人工感染样品中检测到弓形虫急性感染，可为弓形虫急性感染的诊断提供参考，对临床上急性弓形虫病的治疗有指导意义。 相似文献
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本文应用抗弓形虫单克隆抗体ELISA对猪弓形虫病感染进行现场调查研究。用一般ELISA的间接法、双单抗夹心法、单抗及第二抗体夹心法分别检测Ab、Cag及CIC。杭州地区一般屠宰猪血清阳性检出率分别为52.79%、0%及8.22%;有弓形虫病流行史的某种猪场母猪血清的阳性检出率分别达84.51%、32.65%及68.39%,三者均明显高于屠宰猪。14头疑似弓形虫病猪血清的阳性检出率分别为6/14、10/14及12/14,Cag或和CIC阳性率合计为14/14。初步认为应用ELISA间接法检测Ab可作为猪弓形虫感染血清流行病学检查;应用McAb ELISA夹心法检测CAg及CIC具有早期诊断猪弓形虫病的价值,并可作为历史流行点猪弓形虫病是否存在近期流行或尚有活动性感染及暴发性流行的监测方法。 相似文献
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《动物医学进展》2021,42(8)
建立多房棘球绦虫粪抗原双抗体夹心ELISA检测方法,为犬感染多房棘球绦虫的早期诊断提供技术支撑。以5E10H5杂交瘤细胞株腹腔接种Balb/c鼠制备的腹水作为包被抗体,多房棘球绦虫成虫可溶性抗原免疫新西兰大白兔制备的多克隆抗体血清作为检测抗体,HRP标记的驴抗兔IgG作为二抗,建立双抗体夹心ELISA方法,检测试验犬(感染多房棘球绦虫)和阴性对照犬犬粪。结果显示,多房棘球绦虫成虫可溶性抗原具有良好的抗原性并能产生高效价抗体;对该方法的灵敏度进行检测,阳性粪样稀释至1∶10 000时仍显示为阳性;在感染动态分析中,该方法最早可在犬感染72 h后,最迟6 d后检测到多房棘球绦虫粪抗原。表明建立的方法可用于诊断犬多房棘球绦虫感染,为后期研制犬多房棘球绦虫粪抗原双抗体夹心ELISA检测试剂盒奠定了基础。 相似文献
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目的建立检测SIVp27抗原的双抗体夹心ELISA方法并进行初步应用。方法使用ProteinA亲和层析柱纯化腹水中的SIVp27单抗,用过碘酸钠法对单抗进行辣根过氧化物酶标记。经抗体配对实验确定包被抗体和检测抗体,再用棋盘滴定法确定抗体工作浓度后,探索构建检测SIVp27抗原的双抗体夹心ELISA法。应用建立的双抗体夹心ELISA法,对SIV模型猴血浆标本和SHIV模型猴病毒分离培养上清标本进行了检测,并将其结果与Coulter公司试剂盒检测结果进行比较。结果以稀释至20ug/mL的2E12为包被抗体、1:400稀释的酶标3G3为检测抗体为ELISA最优体系。模型猴血浆标本和病毒分离培养上清标本的检测结果表明自建体系可以用于SIVp27抗原的检测,特异性良好,灵敏度略低于Coulter公司试剂盒。结论检测SIVp27抗原的双抗体夹心ELISA方法初步建成,为研制有独立知识产权的检测试剂奠定了一定的基础。 相似文献
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为建立特异性和敏感性高的检验犬细粒棘球绦虫感染的方法。用细粒棘球绦虫(简称,Eg)成虫抗原分别免疫兔和绵羊,收集高免血清,纯化的高免抗体。依据抗体夹心ELISA工作原理,以兔抗体包被,检测感染Eg、不同犬带科绦虫的实验犬和空白犬粪样,绵羊抗体扑捉抗原,HRP标记兔抗绵羊IgG(1∶8 000)催化显色,用酶标仪测定OD 405nm吸光度,用以确定其特异性和敏感性。试验结果表明,敏感性为82.69%(43/52),特异性为85.88%(140/163);粪抗原在感染细粒棘球绦虫16d后可检出,最低抗原浓度为9.7ng/mL即犬感染5条成虫时可检测出阳性。该检测方法具有较好的特异性和灵敏性,为进一步研制检测细粒棘球绦虫虫体抗原ELISA检测试剂盒奠定了基础。 相似文献
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目的观察人工感染卫氏并殖吸虫的犬血清中特异性抗体和循环抗原的动态变化。方法按常规方法从阳性溪蟹中分离卫氏并殖吸虫囊蚴并定量感染家犬,从感染后d4开始采血分离血清,用多抗dot-ELISA法检测犬血中循环抗原(CAg),观察从d4到d133之间感染犬血中循环抗原(CAg)及对感染卫氏并殖吸虫2个月的犬用吡喹酮治疗前后血清循环抗原(CAg)的动态变化。用ELISA法检测从感染2w至19w不同间隔时间内犬血清中特异性抗体(Ab)的动态变化。结果人工感染卫氏并殖吸虫的家犬,有2只犬在感染d6时有循环抗原出现,d10 6只感染犬都能检测到循环抗原,检出稀释度在1∶8～1∶128之间,到感染后14d时,稀释度最高可达到1∶256,并一直维持到34d,56d以后逐渐下降,到84d下降至零。对感染卫氏并殖吸虫的犬用吡喹酮治疗3d后,其循环抗原有短暂出现上升的趋势,但在6d后逐渐下降并消失。感染犬在4周时可检测到特异性抗体,抗体最高滴度维持时间为4周～12周,并一直维持在一个较高的水平上。结论犬在感染卫氏并殖吸虫后的10～56d内,用多抗dot-ELISA法可在其血清中检测到循环抗原(CAg),得出在这段时间检测循环抗原具有早期诊断价值。但感染犬在用吡喹酮药物治疗后有短暂的循环抗原出现,一周后逐渐消失。 相似文献
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一种简易,快速检测弓形虫循环抗原的酶联免疫吸附试验 总被引：2，自引：2，他引：2
应用双抗体酶联免疫吸附试验(ELISA)夹心法,检测人工感染弓形虫兔血清循环抗原(CAg)的结果:潜伏期内的阳性检出率为10％;急性期和亚急性期的阳性率为40％～100％;慢性早期为20％。检出弓形虫抗原量为0.63μg/ml。本法与血吸虫、肺吸虫、丝虫、钩虫、蛔虫及旋毛虫抗原试验,均呈阴性。上述结果表明,本法具有特异、敏感、简易、快速等特点,可作为急性弓形虫病的快速诊断方法。 相似文献
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青海省牛弓形虫病的ELISA诊断及试剂盒建立 总被引：2，自引：1，他引：1
用弓形虫的重组蛋白SAG1作为ELISA诊断抗原,建立了ELISA诊断试剂盒,并对青海省牛群进行弓形虫病的血清学诊断。经对所收集的1856份牛血清进行弓形虫抗体检测,共检出阳性血清71份,阳性率约为3.83%。结果表明青海省牛群中存在弓形虫病的感染。 相似文献
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用牛病毒性腹泻病毒(BVDV)单克隆抗体包被酶标板,以兔多克隆抗体作为夹心抗体,建立BVDV抗原捕获ELISA(AC-ELISA)检测方法,优化反应条件并对该方法的稳定性等指标进行了测试和评价。结果表明,单抗最佳包被质量浓度为5μg/mL,兔多抗血清最佳质量浓度为10μg/mL;单抗在4℃包被12~24 h,多抗在37℃作用1 h为双抗体的最佳反应条件;酶标抗体最适稀释度1∶10000,最适作用时间为1 h;采用1%BSA和1%明胶分别在抗体包被后和加入待检抗原反应后进行两次封闭效果好。用AC-ELISA方法检测临床采集的11份牛腹泻病料和12份健康牛组织样品,同时以病毒分离和RT-PCR检测方法做对比,3种方法符合率很高。研究表明AC-ELISA方法稳定性好,可用于BVDV的临床快速检测。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献