The work carried out in this study was supported in part by the Royal Veterinary College through the student research projects fund, as well as the Biotechnology and Biological Sciences Research Council and the Department for International Development (grant number BB/H009337/2). This manuscript has been assigned the reference PPB_00795 by the RVC.

1.模板制备注:怀疑含有的DNA从该感染的鸡的七个艾美球虫物种之一衍生的任何基因组DNA模板可以被用作模板用于基于LAMP的艾美尔球虫种的识别。这里描述在例行验应收集肠组织样本进行现场诊断分析。 <ol><li>选择肠的部分（或部分），以进行测试。请参阅表1为指导，以取样点的选择和最有可能出现18和图1的取样点分布和位置的品种，特定范围的艾美尔球虫种。 注:这是至关重要，因为艾美特有尤其是主机站点。每个物种感染的鸡是由它的目标19肠道区域定义。这一决定可以由农庄以往的经验，兴趣在一个或Mo的影响再具体的艾美球虫或其它诊断 ​​指标6。 </li><li>消费5厘米或选择来测试使用艾美球虫无菌剪刀或手术刀肠部（S）的较长的长度。任选地，存储样品用于随后的分析中固定剂例如在RNAlater中18％或95％的乙醇。 注:如果在乙醇储存样品应当在无菌三 - 乙二胺四乙酸充分洗涤（TE）缓冲液在使用前。 </li><li>切取试样打开纵向，从自由使用无菌玻璃显微镜载玻片的任一边缘或乙醇/火焰灭菌剪刀片粘膜层除去大部分肠内容物（如果存在）和刮除细胞。任选的合并样本包括来自所有4的物种特异性肠位点在单管细胞。 </li><li>把刮下材料到含有100微升无菌TE缓冲液含1无菌1.5毫升螺杆顶部的离心管为0％（重量/体积）的Chelex 100树脂。 </li><li>用力摇动每个样品1分钟。确保螺杆顶部是牢牢封闭，然后孵育在沸水浴中10分钟。 </li><li>煮沸后允许每个样品在环境温度下冷却1-2分钟。 </li><li>离心机使用微量的最高速度（ 例如，〜万XG），持续1分钟各样品。 </li><li>收集2微升所得上清液为将要进行的模板中的每个灯检测。任选地，集中多个肠部位在一个单一的管，以提供一个多站点检测。 </li></ol> 2. 艾美 LAMP引物制备（预检测） <ol><li>准备艾美 LAMP底漆股票足够100测定: <ol><li>通过增加分子级水至100微米的浓度（所指定的制造商）重建每个冻干艾美 LAMP底漆。如果未指定，计算分子级所需的水全光照的体积克各引物的物理和分子量。 </li><li>待测定吸移管60微升分子级水到一个单独0.5毫升翻盖微量离心管中的每个的艾美球虫种。 </li><li>添加的引物FIP，BIP，F3，B3的LF和LB特异于靶艾美尔球虫种使用表2中所示的卷的水，形成了一系列的7种特异性引物混合物。 </li><li>简要涡混合底漆的解决方案，然后脉冲离心和冷冻备用。 </li></ol></li><li>制备LAMP反应mastermix每个艾美尔球虫种待测定。由样本数目乘以在表3所示的体积，并添加三至阳性对照，阴性对照和移液备用。吸取到0.5或1.5毫升翻盖的离心管。 </li></ol> 3. 艾美 LAMP检测<ol><li>吸取23微升艾美球虫专用的Bst DNA聚合酶/ LAMP mastermix成0。5毫升离心管中。 </li><li>添加2微升DNA模板（在第1制备的），使得最终反应的25μl的体积。 </li><li>添加2微升的艾美球虫种特异性基因组DNA，以一个反应（阳性对照）。添加2微升的分子级水到反应（阴性对照）。 注意:如果物种特异性的基因组DNA是不可用，可以使用先前的阳性LAMP或标准的PCR产物来代替。 </li><li>孵育在水浴或加热块在62℃下30分钟。任选地，脱激活的Bst DNA聚合酶，通过加热至80℃达 10分钟，如果反应是不会被立即读出。 </li></ol> 4. LAMP检测读出<ol><li>在温育结束时评估由眼睛在室内光各反应的颜色。阴性结果出现粉红色到紫色，阳性结果出现天蓝20。 </li><li>可选，确认LAMP检测结果在实验室及其他实验室使用的核酸染色（每5微升ORY通过混合5微升LAMP反应产物与在1×的Tris /硼酸盐/ EDTA（TBE）缓冲液用2％琼脂糖凝胶的琼脂糖凝胶电泳将1μl的DNA凝胶上样缓冲液，预染50毫升琼脂糖）。加入5微升1Kb的分子大小的DNA梯的车道1的凝胶，以允许片段大小的计算。 </li></ol>

<ol>
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The authors declare that they have no competing financial interests.

The Eimeria species-specific LAMP assays described in this paper offer a new diagnostic tool kit in support of effective control of coccidia and the disease coccidiosis. The outcomes of eimerian infection can include severe economic loss as well as seriously compromised bird welfare and increased susceptibility to colonisation by zoonotic pathogens21. Opportunities to monitor flocks for the occurrence of some, or all Eimeria species can provide early warning of a breakdown in anticoccidial control efficacy. Key advantages of LAMP include robust target specificity, resulting from the requirement for six different DNA sequence targets, as well as high sensitivity, boosted by the inclusion of loop primers13, although the qualitative, not quantitative nature of LAMP may be considered a limitation. It is not currently possible to discriminate low level parasite escape from routine chemoprophylaxis or live vaccine replication from unchecked eimerian replication. Nonetheless, the technical ease of the protocol and definitive readout offers considerable improvement over the existing specialist and frequently subjective pathology- and morphology-led approaches6,7. Each assay may be completed at a cost of ~&#163;0.75 per sample, independent of labour and equipment set up expenses. Thus, LAMP assays are also more cost effective than other molecular diagnostics such as PCR, since they require an isothermal incubation with no need for specialist equipment. 
For many years access to Eimeria genomic DNA as template has limited the development and application of molecular field diagnostics. The oocyst is the most readily accessible phase of the eimerian lifecycle, but routine DNA extraction requires laboratory facilities22. Other, more labile intestinal lifecycle stages require purification prior to DNA preparation to prevent PCR inhibition and a consequent loss of sensitivity23,24. The ability to extract eimerian DNA of a quality suitable for LAMP using equipment no more specialised than a microcentrifuge and a water bath, supplemented by inhibitor adsorption using chelex resin, now promotes the wider use of molecular biology in eimerian diagnostics. Intriguingly, the reported detection of quantitative PCR-measurable Eimeria DNA in intestinal tissue 20 days after the initiation of parasite infection, 11 days after the last detectable oocyst output, raises the suggestion that LAMP may be used to detect resolved parasite exposure as well as ongoing infection, even after any visible lesions may have been resolved25. 
The relatively low cost and low technical requirements of LAMP Eimeria diagnostics can promote their application in the developing world where other more established approaches may not be available or appropriate. For this to be applicable each assay must be capable of detecting all strains which may be circulating within each region. While understanding of the genetic diversity prevailing among Eimeria species is limited26, the use of target sequences previously validated for use in quantitative PCR with strains from Africa, Asia, Europe and South America provides some evidence of conservation, supporting the utility of these LAMP assays around the world10.

全球鸡肉产量增加了10倍，在过去50年发展中世界的托管见证了发达国家扩大近四倍<a href="http://www.faostat.org">（www.faostat.org） 。</a>由于鸡的生产对世界粮食安全的相关性已变得如此得具有病原体可在鸡引起严重的疾病的配置文件。一个典型的例子是艾美尔球虫种，无处不在的原生动物寄生虫这会导致肠道疾病球虫病1。无论鸡饲养的一种或多种艾美球虫物种很可能是常见2-4。在发达国家艾美耳球虫主要是由化学预防控制，使用航天飞机或轮换计划，以减少阻力5的影响。活疫苗还用在系统中的鸟值足以证明费用（ 例如，种畜，层和一些肉鸡5）。作为一名RESULT这些措施的临床球虫病常常很好的控制，虽然亚临床感染是常见的5。在发展中国家，疫苗接种是罕见的，药物的应用程序频繁少消息灵通。作为结果的亚临床和临床球虫病是更常见的，施加一个显著经济影响3。 eimerian感染的诊断已传统上依赖于病变得分验尸，尽管使用最广泛的评分系统连作者指出对于有些种类"看来值得怀疑是否这样一个程序应在任何但中度严重的感染可以尝试"6。补充证据可通过显微镜检测粪便或枯枝落叶样品中的环保性卵囊生命周期阶段的聚集，但重叠的形态可以混淆所有，但专家6,7。利用聚合酶链式反应的分子的替代（PCR），随机amplificatioÑ ​​多态性DNA的PCR（RAPD-PCR）和定量PCR技术，已可用于长达20年8-10，但到目前为止，他们都未能普及。相对费用和专科实验室设备或处理的要求限制了它们的摄取，尽管往往主观，技术要求高的老pathology-的性质和显微镜为基础的方法10,11。这样的限制可能被夸大许多世界上较贫穷的地区，如东南亚，那里的球虫病对贫困的影响可能更大比例12。在回答有新的直接和敏感的，但成本效益， 艾美尔球虫种特异的诊断试验的明确要求。 环介导等温扩增（LAMP）是容易制备的DNA聚合酶驱动的技术，它是能够扩增大量的DNA组成。最重要的是，LAMP使用的Bst.DNA聚合物A DNA本身代替的Taq DNA聚合酶在PCR中常用的，这有利于DNA扩增在单一恒定温度下，而不用于热循环13,14的要求。灯泡可以是适合于应用，即使在最起码的实验室或在外地。通过对许多PCR抑制剂，高灵敏度和特异性的相对阻力Characterised，LAMP法检测已被开发用于广泛的病原体，包括传染性法氏囊病病毒， 产气荚膜梭菌和隐孢子虫 15-17。在回答具体到每个感染鸡的七个艾美球虫的LAMP检测的面板也已开发出18个新的具有成本效益的艾美尔球虫种特定的诊断要求。应用新的检测包括监测寄生虫的发生，尤其是价值的特定物种的协会，如巨型艾美耳球虫和毒害艾美耳球虫经济PE差rformance 3,4。其它应用包括评估一个农场的抗球虫策略，亚临床感染或临床疾病和风险由艾美球虫所构成的一个农场的评估诊断的功效。

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			<td height="21" style="height:21px;width:295px;">Name</td>
			<td style="width:161px;">Company</td>
			<td style="width:139px;">Catalogue number</td>
			<td style="width:295px;">Comments</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">RNAlater</td>
			<td style="width:161px;">Ambion</td>
			<td style="width:139px;">AM7024</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Ethanol</td>
			<td style="width:161px;">VWR Chemicals</td>
			<td style="width:139px;">20821.321</td>
			<td style="width:295px;">Caution, highly flammable</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">100 x Tris-EDTA (TE) buffer concentrate</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">T9285</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Chelex 100 resin</td>
			<td style="width:161px;">Bio-Rad</td>
			<td style="width:139px;">142-1253</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Molecular grade water</td>
			<td style="width:161px;">Invitrogen</td>
			<td style="width:139px;">10977035</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. acervulina F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CCTAACATTTCGCTTCACGGAC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. acervulina B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*ATGAGCAAGTGGAACACCTTG</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. acervulina FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*AGAGCACAGTGGCAGTGC-AGCAGACAGCATGGCTTACCT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. acervulina BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAAGACCCTCTGAAGAACGGA-CCTTCTCACCGCTTACCGG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. acervulina LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TAAGGTTACACCCGTGGAGG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. acervulina LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCCATGCACAAAGCGACTT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. brunetti F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GGCCATCAAGTTCCATGAGC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. brunetti B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TCAACCTCCTGAGTGTGGTT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. brunetti FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAAAATGCCTTCGTAGCTGCT-GCTGGGTACGGAGCGTCTT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. brunetti BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TACTTCCTAGGATCCATCCTCGC-AGTTTCGCTGCCGCCTC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. brunetti LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAAACGCTCGAACATGGC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. brunetti LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CTTCTCCACAGACCCAGAGGT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. maxima F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*ACTACGGAAAAGTGCGTAGCT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. maxima B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CCTTCCTCCCTTCTGAAAACTG</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. maxima FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAGTCACTGCTGATGTACCAAA 
			AG-GAACTATGCCGCTTTCCCCTG</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. maxima BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*AGAATGCGGATTTGTTAGCAGC-AGCAAGTCCAAGGTGTGTGTA</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. maxima LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CAAGCCTACGCGGACATC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. maxima LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TTATGCAGCTGGGTCAACG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. mitis F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*ACGATAGCCAAGACACGTAAGG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. mitis B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CCCCGTGATAAGAGTAGGAACA</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. mitis FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGCGGGTCGTGAGATTTAAATT 
			AT-GGAAGATCAGGACGGGCACT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. mitis BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GTTTCAGTTGATGAACAAGCGA 
			GA-TGCGCCTCTAGAATCAAGACG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. mitis LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TCCATGCATCCCCTTGTT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. mitis LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGTGGGCACAGATTGATTC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. necatrix F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*TGGCTTTCCCGCGTACC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. necatrix B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGGCCCAACACAAAGACTG</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. necatrix FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGCTTGAGTTTTAAGCTATGCA 
			CA-GACCCAAGCAGCTCACCAA</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. necatrix BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGCCATGCCATTCAATGAACG-*GAGGCATACCGGCGTTGTC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. necatrix LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GTCTGTAACTTGGGACGTTGT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. necatrix LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAACAGCCGGAGCCTCTC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. praecox F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCCCTTGTATGTTGCTGTTTCT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. praecox B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCGCACGAATCTGAATCACAC</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. praecox FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*ATCTCCTCAAAGACTTTCGCGT 
			A-GCGCTTGGCTATATCCATAGG</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. praecox BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCTCTCGTGGCATACTTGC-GCCAGGAGCCACTGATTGT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. praecox LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GAATAGCATTGCCAGGTGG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. praecox LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GTCCACTGTCATTAATATTGC 
			TGC</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. tenella F3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCTTGTGAAGGTCAGCGTG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. tenella B3</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCTGAGTCCATACGTACTTCCT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. tenella FIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GCCACTGCTATGGAAAGTCAC 
			AC-CATAACTGGCATGCAGGGGT</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. tenella BIP</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*GTTTGGCCCGAAAGTTGTGAA 
			GA-CGTCAGAAATTGCTGCCCAAT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">E. tenella LB</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CGCATGTGCAGTTGAAGACA</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:295px;">E. tenella LF</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">VC00021</td>
			<td style="width:295px;">*CCAAATGTATCTGCTAGTTATA 
			TTAACAAG</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">10 x ThermoPol reaction buffer</td>
			<td style="width:161px;">New England Biolabs</td>
			<td style="width:139px;">B9004S</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="26">
			<td height="26" style="height:26px;width:295px;">MgSO4</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">M7506</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">dNTPs</td>
			<td style="width:161px;">Promega</td>
			<td style="width:139px;">U1330</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Betaine solution (5 M)</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">B0300</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Bst polymerase</td>
			<td style="width:161px;">New England Biolabs</td>
			<td style="width:139px;">M0275S</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Hydroxynaphthol blue</td>
			<td style="width:161px;">Sigma-Aldrich</td>
			<td style="width:139px;">33936</td>
			<td style="width:295px;">Dissolved in molecular grade water.</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">UltraPure agarose</td>
			<td style="width:161px;">Invitrogen</td>
			<td style="width:139px;">16500-500</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">10 x Tris/Borate/EDTA (TBE) buffer</td>
			<td style="width:161px;">Invitrogen</td>
			<td style="width:139px;">AM9863</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">Blue/Orange DNA loading dye (x6)</td>
			<td style="width:161px;">Promega</td>
			<td style="width:139px;">G1881</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:295px;">GeneRuler 1Kb DNA ladder</td>
			<td style="width:161px;">Thermo Scientific</td>
			<td style="width:139px;">SM0313</td>
			<td style="width:295px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:295px;">SafeView nucleic acid stain</td>
			<td style="width:161px;">NBS Biologicals</td>
			<td style="width:139px;">NBS-SV</td>
			<td style="width:295px;"></td>
		</tr>
	</tbody>
</table>

loop-mediated isothermal amplification (lamp) assays for the species-specific detection of eimeria that infect chickens

Eimeria species parasites, protozoa which cause the enteric disease coccidiosis, pose a serious threat to the production and welfare of chickens. In the absence of effective control clinical coccidiosis can be devastating. Resistance to the chemoprophylactics frequently used to control Eimeria is common and sub-clinical infection is widespread, influencing feed conversion ratios and susceptibility to other pathogens such as Clostridium perfringens. Despite the availability of polymerase chain reaction (PCR)-based tools, diagnosis of Eimeria infection still relies almost entirely on traditional approaches such as lesion scoring and oocyst morphology, but neither is straightforward. Limitations of the existing molecular tools include the requirement for specialist equipment and difficulties accessing DNA as template. In response a simple field DNA preparation protocol and a panel of species-specific loop-mediated isothermal amplification (LAMP) assays have been developed for the seven Eimeria recognised to infect the chicken. We now provide a detailed protocol describing the preparation of genomic DNA from intestinal tissue collected post-mortem, followed by setup and readout of the LAMP assays. Eimeria species-specific LAMP can be used to monitor parasite occurrence, assessing the efficacy of a farm&#8217;s anticoccidial strategy, and to diagnose sub-clinical infection or clinical disease with particular value when expert surveillance is unavailable.

实验验证在验证过程中各艾美尔球虫种特异性LAMP方法是使用表示该感染的鸡，以及鸡基因组DNA作为主机控制所有七个艾美尔球虫种纯的DNA样品的一组测试。琼脂糖凝胶电泳来解析每个测定并证明绝对物种特异性无主机交叉反应18。接着，使用纯化的禽艾美球虫基因组DNA揭示基因组1 10之间，并拷贝18的检测灵敏度极限的10倍连续稀释系列制备。没有上限与取得了积极成果，其中包括最高浓度（100,000基因组拷贝）18确定。 与现场采样应用收集艾美球虫测试样品可能被从发现死鸡衍生，扑杀为p的结果OOR健康或宰杀前哨健康监测，表明的1至3个可能的一个样本大小时的程序的一部分。测试从美国肉鸡养殖场作为监测计划的一部分，收集了三只小鸟取得了三组肠道样品。目标应用的种类特异性的LAMP测定的，优先的优选的肠部位的每个的艾美球虫种（ 表1），允许视觉识别eimerian感染的所有鸟类使用hydroxynaphthol蓝作为指示剂（ 图2A）进行测试。使用hydroxynaphthol蓝色时实现具有负LAMP反应的颜色范围可以从紫罗兰到粉红色，但是总是由一个肯定的结果所取得的蓝色鲜明。确认通过琼脂糖凝胶电泳提供类似的结果（ 图2B）。在现场应用中，用户可以选择适用全屏对所有7种，或只针对那些优先物种重要的或已知的可循环在农场或周围区域。 的PCR技术为基础的方法未能成为确立为诊断艾美球虫的发生强调在任何新的测试为了简单的要求。而LAMP提供简单的准备和处理比PCR，要求测试每只鸡多发性肠部位依然令人沮丧。生产每只鸡的单个合并的DNA样品，然后可以与一个或多个灯测定测试的，很可能是更有吸引力。处理每只鸡1合并样本，表示从各表1中的所有7 LAMP检测所述和之前的DNA制剂，以汇集，用于测试的特定的肠部位收集的材料提供的相同的结果时，每个肠位点分别进行处理（ 图2与图3相比）。 <img alt="图1" src="/files/ftp_upload/52552/52552fig1.jpg"/&gt; 图1.肠道采样点为LAMP检测艾美球虫寄生虫感染的鸡。每个艾美球虫有针对性的肠道地区是由彩色线条突出，采样由虚线黑线之间的数字表示的首选网站（E.堆型艾美 :黄/ 1，E. BRUNETTI:粉红色/ 2，E最大值 :蓝/ 3， 缓症E.:橙/ 4，E.球虫 :红/ 5，E.雷竹 :绿色/ 6和球虫 :灰/ 7）。 <a href="https://www.jove.com/files/ftp_upload/52552/52552fig1large.jpg" target="_blank">请点击此处查看该图的放大版本。</a> <img alt="图2" src="/files/ftp_upload/52552/52552fig2.jpg" /> 图2. LAMP eimerian感染的诊断来回回米三个商业肉鸡。LAMP反应，用（A）解析hydroxynaphthol蓝色，其中一个天蓝反应是积极的和紫粉色的反应是负面的，而（B）的琼脂糖凝胶电泳。取样的肠部位表1中所示为每个寄生虫物种。 A = E.堆型艾美 ，B = E. BRUNETTI，马= E.千里马 ，MI = E.缓症 ，N = E.毒害艾美耳球虫 ，P = E.雷竹和T = E.球虫 。 1巷包含GeneRuler 1Kb的DNA阶梯。 <a href="https://www.jove.com/files/ftp_upload/52552/52552fig2large.jpg" target="_blank">请点击此处查看该图的放大版本。</a> <img alt="图3" src="/files/ftp_upload/52552/52552fig3.jpg" /> 使用汇集图3. LAMP eimerian感染的诊断样品从三个不同的商业肉鸡。LAMP REAC使用hydroxynaphthol蓝色，其中一个天蓝反应是积极的，紫粉色的反应是消极的系统蒸发散解决。 A = E.堆型艾美 ，B = E. BRUNETTI，马= E.千里马 ，MI = E.缓症 ，N = E.毒害艾美耳球虫 ，P = E.雷竹和T = E.球虫 。 <a href="https://www.jove.com/files/ftp_upload/52552/52552fig3large.jpg" target="_blank">请点击此处查看该图的放大版本。</a> <table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td> 示例站点 </td><td> 艾美尔球虫种测定法（最有可能的） </td></tr><tr><td>十二指肠（D） </td><td> 堆型艾美球虫，大肠杆菌雷竹 </td></tr><tr><td>空肠/回肠*（J / I） </td><td> E.最大值，E.球虫 </td></tr><tr><td>盲肠（C） </td><td> E.毒害艾美耳球虫，球虫 </td></tr><tr><td>回肠末端（TI） </td><td> E. BRUNETTI，缓症E. </td></tR&gt; <tr><td>合并的样品（P）的</td><td> 堆型艾美球虫，大肠杆菌BRUNETTI，巨型艾美球虫，大肠杆菌和缓，E.毒害艾美耳球虫，大肠杆菌雷竹，球虫 </td></tr></tbody></table>要抽样表1肠区域专用的选择候补的艾美球虫种测定。地区的选择而变化为如图1各艾美尔球虫种。合并的样品包括来自所有四个特定网站然后将其合并为DNA制备收集的材料。 <table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td> 入门* </td><td> 股票浓度（μM） </td><td> 体积（微升） </td></tr><tr><td>水</td><td> - </td><td> 60 </td></tr><tr><td>正向内引物（FIP） </td><td> 100 </td><td> 40 </td></tr><tr><td>落后的内蒙古小学滨海（BIP） </td><td> 100 </td><td> 40 </td></tr><tr><td>正向外引物（F3） </td><td> 100 </td><td> 10 </td></tr><tr><td>落后的外引物（B3） </td><td> 100 </td><td> 10 </td></tr><tr><td>正向循环（LF） </td><td> 100 </td><td> 20 </td></tr><tr><td>环向后（LB） </td><td> 100 </td><td> 20 </td></tr><tr><td> 总 </td><td></td><td> 200 </td></tr></tbody></table> 表2.准备一个LAMP引预混料，准备底漆预混料LAMP所需的组件和比例。显示容积为100 LAMP反应。 *所示的材料和底漆身份Barkway 等人，（2011）18。 <table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td></td><td> 股票浓度ñ </td><td> 最终的反应浓度ñ </td><td> 每个反应体积（微升） </td></tr><tr><td> DDW </td><td> - </td><td> - </td><td> 10.1 </td></tr><tr><td> ThermoPol缓冲区</td><td> 10× </td><td> 1个</td><td> 2.5 </td></tr><tr><td> 硫酸镁 </td><td> 100毫米</td><td> 2毫米</td><td> 0.5 </td></tr><tr><td>引物混合物* </td><td colspan="2">表2 </td><td> 2.5 </td></tr><tr><td>的dNTP </td><td> 25毫米</td><td> 400林M </td><td> 0.4 </td></tr><tr><td>甜菜碱</td><td> 5米</td><td> 1M的</td><td>五</td></tr><tr><td> Hydroxynaphthol蓝色</td><td> 3毫米</td><td> 120μM </td><td> 1 </td></tr><tr><td> BST DNA聚合酶</td><td> 8000 U / ml的</td><td> 8ü </td><td> 1 </td></tr><tr><td> 总 </td><td></td><td></td><td> 23 </td></tr></tbody></table> 表3.准备一个LAM的P反应mastermix。* 艾美耳球虫种属特异性。

Watch this Scientific Journal Video about Loop-mediated Isothermal Amplification LAMP Assays for the Species-specific Detection of Eimeria that Infect Chickens at JoVE.com

Loop-mediated Isothermal Amplification LAMP Assays for the Species-specific Detection of Eimeria that Infect Chickens

Diagnosis of Eimeria infection in chickens remains demanding. Parasite morphology- and host pathology-led approaches are commonly inconclusive, while molecular approaches based on PCR have proven demanding in cost and expertise. The aim of this protocol is to establish loop-mediated isothermal amplification (LAMP) as a straightforward molecular diagnostic for eimerian infection.

环介导等温扩增（LAMP）法进行的物种特异性检测<em&gt;艾美耳球虫</em&gt;可感染鸡

Eimeria species parasites, protozoa which cause the enteric disease coccidiosis, pose a serious threat to the production and welfare of chickens. In the ...

loop-mediated-isothermal-amplification-lamp-assays-for-species

Research

JoVE Journal

Immunology and Infection

Loop-mediated Isothermal Amplification (LAMP) Assays for the Species-specific Detection of Eimeria that Infect Chickens

26.9K 次观看.  Royal Veterinary College, London. Diagnosis of Eimeria infection in chickens remains demanding. Parasite morphology- and host pathology-led approaches are commonly inconclusive, while molecular approaches based on PCR have proven demanding in cost and expertise. The aim of this protocol is to establish loop-mediated isothermal amplification (LAMP) as a straightforward molecular diagnostic for eimerian infection.

视频: Loop-mediated Isothermal Amplification LAMP Assays for the Species-specific Detection of Eimeria that Infect Chickens

Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce

This protocol describes a simple approach for adhesive-tape-based sampling of tomato and other fresh produce surfaces, followed by on-tape fluorescence in situ hybridization (FISH) for rapid culture-independent detection of Salmonella spp. Cell-charged tapes can also be placed face-down on selective agar for solid-phase enrichment prior to detection. Alternatively, low-volume liquid enrichments (liquid surface miniculture) can be performed on the surface of the tape in non-selective broth, followed by FISH and analysis via flow cytometry. To begin, sterile adhesive tape is brought into contact with fresh produce, gentle pressure is applied, and the tape is removed, physically extracting microbes present on these surfaces. Tapes are mounted sticky-side up onto glass microscope slides and the sampled cells are fixed with 10% formalin (30 min) and dehydrated using a graded ethanol series (50, 80, and 95%; 3 min each concentration). Next, cell-charged tapes are spotted with buffer containing a Salmonella-targeted DNA probe cocktail and hybridized for 15 - 30 min at 55&deg;C, followed by a brief rinse in a washing buffer to remove unbound probe. Adherent, FISH-labeled cells are then counterstained with the DNA dye 4',6-diamidino-2-phenylindole (DAPI) and results are viewed using fluorescence microscopy. For solid-phase enrichment, cell-charged tapes are placed face-down on a suitable selective agar surface and incubated to allow in situ growth of Salmonella microcolonies, followed by FISH and microscopy as described above. For liquid surface miniculture, cell-charged tapes are placed sticky side up and a silicone perfusion chamber is applied so that the tape and microscope slide form the bottom of a water-tight chamber into which a small volume (&le; 500 &mu;L) of Trypticase Soy Broth (TSB) is introduced. The inlet ports are sealed and the chambers are incubated at 35 - 37&deg;C, allowing growth-based amplification of tape-extracted microbes. Following incubation, inlet ports are unsealed, cells are detached and mixed with vigorous back and forth pipetting, harvested via centrifugation and fixed in 10% neutral buffered formalin. Finally, samples are hybridized and examined via flow cytometry to reveal the presence of Salmonella spp. As described here, our "tape-FISH" approach can provide simple and rapid sampling and detection of Salmonella on tomato surfaces. We have also used this approach for sampling other types of fresh produce, including spinach and jalape&ntilde;o peppers.

Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce

This protocol describes a simple adhesive-tape-based approach for sampling of tomato and other fresh produce surfaces, followed by rapid whole cell detection of Salmonella using fluorescence in situ hybridization (FISH).

胶粘剂基于磁带的采样和荧光组合原位杂交快速检测沙门氏菌新鲜农产品

This protocol describes a simple approach for adhesive-tape-based sampling of tomato and other fresh produce surfaces, followed by on-tape fluorescence in ...

科研

免疫与感染

Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays

Amplifying viral genes and quantifying HIV-1 RNA in HIV-1 infected individuals with viral loads below the limit of detection by standard assays (below 50-75 copies/ml) is necessary to gain insight to viral dynamics and virus host interactions in patients who naturally control the infection and those who are on combination antiretroviral therapy (cART). 
Here we describe how to amplify viral genomes by single genome sequencing (the SGS protocol) 13, 19 and how to accurately quantify HIV-1 RNA in patients with low viral loads (the single-copy assay (SCA) protocol) 12, 20. 
The single-copy assay is a real-time PCR assay with sensitivity depending on the volume of plasma being assayed. If a single virus genome is detected in 7 ml of plasma, then the RNA copy number is reported to be 0.3 copies/ml. The assay has an internal control testing for the efficiency of RNA extraction, and controls for possible amplification from DNA or contamination. Patient samples are measured in triplicate.
The single-genome sequencing assay (SGS), now widely used and considered to be non-labor intensive 3, 7, 12, 14, 15,is a limiting dilution assay, in which endpoint diluted cDNA product is spread over a 96-well plate. According to a Poisson distribution, when less than 1/3 of the wells give product, there is an 80% chance of the PCR product being resultant of amplification from a single cDNA molecule. SGS has the advantage over cloning of not being subjected to resampling and not being biased by PCR-introduced recombination 19. However, the amplification success of SCA and SGS depend on primer design. Both assays were developed for HIV-1 subtype B, but can be adapted for other subtypes and other regions of the genome by changing primers, probes, and standards.

Quantifying levels of HIV-1 RNA in plasma and sequencing single HIV-1 genomes from individuals with viral loads below the limit of detection (50-75 copies/ml) is difficult. Here we describe how to extract and quantify plasma viral RNA using a real time PCR assay that reliably measures HIV-1 RNA down to 0.3 copies/ml and how to amplify viral genomes by single genome sequencing, from samples with very low viral loads.

在艾滋病毒感染者病毒载量低于检测限制标准的临床实验放大和量化HIV - 1 RNA

Amplifying viral genes and quantifying HIV-1 RNA in HIV-1 infected individuals with viral loads below the limit of detection by standard assays (below ...

Assays for the Identification of Novel Antivirals against Bluetongue Virus

To identify potential antivirals against BTV, we have developed, optimized and validated three assays presented here. The CPE-based assay was the first assay developed to evaluate whether a compound showed any antiviral efficacy and have been used to screen large compound library. Meanwhile, cytotoxicity of antivirals could also be evaluated using the CPE-based assay. The dose-response assay was designed to determine the range of efficacy for the selected antiviral, i.e. 50% inhibitory concentration (IC50) or effective concentration (EC50), as well as its range of cytotoxicity (CC50). The ToA assay was employed for the initial MoA study to determine the underlying mechanism of the novel antivirals during BTV viral lifecycle or the possible effect on host cellular machinery. These assays are vital for the evaluation of antiviral efficacy in cell culture system, and have been used for our recent researches leading to the identification of a number of novel antivirals against BTV.

Three assays, including the cytopathic effect (CPE)-based assay, dose-response assay and Time-of-Addition (ToA) assay have been developed, optimized, validated and utilized to identify novel antivirals against Bluetongue virus (BTV), as well as to determine the possible Mechanism-of-Action (MoA) for newly identified antivirals.

为检验新型抗病毒药物的鉴定对蓝舌病病毒

To identify potential antivirals against BTV, we have  developed, optimized and validated three assays presented here. The CPE-based  assay was the first ...

A Protocol to Infect Caenorhabditis elegans with Salmonella typhimurium

In the last decade, C. elegans has emerged as an invertebrate organism to study interactions between hosts and pathogens, including the host defense against gram-negative bacterium Salmonella typhimurium. Salmonella establishes persistent infection in the intestine of C. elegans and results in early death of infected animals. A number of immunity mechanisms have been identified in C. elegans to defend against Salmonella infections. Autophagy, an evolutionarily conserved lysosomal degradation pathway, has been shown to limit the Salmonella replication in C. elegans and in mammals. Here, a protocol is described to infect C. elegans with Salmonella typhimurium, in which the worms are exposed to Salmonella for a limited time, similar to Salmonella infection in humans. Salmonella infection significantly shortens the lifespan of C. elegans. Using the essential autophagy gene bec-1 as an example, we combined this infection method with C. elegans RNAi feeding approach and showed this protocol can be used to examine the function of C. elegans host genes in defense against Salmonella infection. Since C. elegans whole genome RNAi libraries are available, this protocol makes it possible to comprehensively screen for C. elegans genes that protect against Salmonella and other intestinal pathogens using genome-wide RNAi libraries.

A Protocol to Infect Caenorhabditis elegans with Salmonella typhimurium

C. elegans has emerged as a new genetic model to study host-pathogen interactions. Here we describe a protocol to infect C. elegans with Salmonella typhimurium coupled with the double-strand RNAi interference technique to examine the role of host genes in defense against Salmonella infection.

一个协议感染<em&gt;秀丽隐杆线虫</em&gt;与<em&gt;鼠伤寒沙门氏菌</em

In the last decade, C. elegans has emerged as an invertebrate organism to study interactions between hosts and pathogens, including the host defense ...

Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

Cell-based systems are useful for discovering antiviral agents. Dissecting the viral life cycle, particularly the early entry stages, allows a mechanistic approach to identify and evaluate antiviral agents that target specific steps of the viral entry. In this report, the methods of examining viral inactivation, viral attachment, and viral entry/fusion as antiviral assays for such purposes are described, using hepatitis C virus as a model. These assays should be useful for discovering novel antagonists/inhibitors to early viral entry and help expand the scope of candidate antiviral agents for further drug development.

Here, we present a protocol that examines specific steps of the viral entry to identify and evaluate novel antiviral agents.

早期的病毒进入测定的鉴定和抗病毒化合物的评价

Cell-based systems are useful for discovering antiviral agents. Dissecting the viral life cycle, particularly the early entry stages, allows a mechanistic ...

Qualitative and Quantitative Assays for Detection and Characterization of Protein Antimicrobials

Initial evaluations of large microbial libraries for potential producers of novel antimicrobial proteins require both qualitative and quantitative methods to screen for target enzymes prior to investing greater research effort and resources. The goal of this protocol is to demonstrate two complementary assays for conducting these initial evaluations. The microslide diffusion assay provides an initial or simple detection screen to enable the qualitative and rapid assessment of proteolytic activity against an array of both viable and heat-killed bacterial target substrates. As a counterpart, the increased sensitivity and reproducibility of the dye-release assay provides a quantitative platform for evaluating and comparing environmental influences affecting the hydrolytic activity of protein antimicrobials. The ability to label specific heat-killed cell culture substrates with Remazol brilliant blue R dye expands this capability to tailor the dye-release assay to characterize enzymatic activity of interest.

Here, we present protocols to rapidly screen and characterize enzymes for antimicrobial activity. The microslide diffusion assay and the dye-release assay utilize target bacterial substrates for qualitative and quantitative enzymatic activity evaluation.

定性和定量测定为检测和蛋白质抗菌药物的表征

Initial evaluations of large microbial libraries for potential producers of novel antimicrobial proteins require both qualitative and quantitative methods ...

The Development of Lyophilized Loop-mediated Isothermal Amplification Reagents for the Detection of Coxiella burnetii

Coxiella burnetii, the agent causing Q fever, is an obligate intracellular bacterium. PCR based diagnostic assays have been developed for detecting C. burnetii DNA in cell cultures and clinical samples. PCR requires specialized equipment and extensive end user training, and therefore, it is not suitable for routine work especially in a resource-constrained area. We have developed a loop-mediated isothermal amplification (LAMP) assay to detect the presence of C. burnetii in patient samples. This method is performed at a single temperature around 60 &#176;C in a water bath or heating block. The sensitivity of this LAMP assay is very similar to PCR with a detection limit of about 25 copies per reaction. This report describes the preparation of the reaction using lyophilized reagents and visualization of results using hydroxynaphthol blue (HNB) or a UV lamp with fluorescent intercalating dye in the reaction. The LAMP reagents were lyophilized and stored at room temperature (RT) for one month without loss of detection sensitivity. This LAMP assay is particularly robust because the reaction mixture preparation does not involve complex steps. This method is ideal for use in resource-limited settings where Q fever is endemic.

The Development of Lyophilized Loop-mediated Isothermal Amplification Reagents for the Detection of Coxiella burnetii

We described here a simple loop-mediated isothermal amplification (LAMP) method using lyophilized reagents for the detection of C. burnetii in patient samples.

冻干环介导等温扩增试剂的检测中的发展<em&gt;贝氏柯克斯体</em

Coxiella burnetii, the agent causing Q fever, is an obligate intracellular bacterium. PCR based diagnostic assays have been developed for detecting C. ...

Assays for Studying the Role of Vitronectin in Bacterial Adhesion and Serum Resistance

Bacteria utilize complement regulators as a means of evading the host immune response. Here, we describe protocols for evaluating the role vitronectin acquisition at the bacterial cell surface plays in resistance to the host immune system. Flow cytometry experiments identified human plasma vitronectin as a ligand for the bacterial receptor outer membrane protein H of Haemophilus influenzae type f. An enzyme-linked immunosorbent assay was employed to characterize the protein-protein interactions between purified recombinant protein H and vitronectin, and binding affinity was assessed using bio-layer interferometry. The biological importance of the binding of vitronectin to protein H at the bacterial cell surface in evasion of the host immune response was confirmed using a serum resistance assay with normal and vitronectin-depleted human serum. The importance of vitronectin in bacterial adherence was analyzed using glass slides with and without vitronectin coating, followed by Gram staining. Finally, bacterial adhesion to human alveolar epithelial cell monolayers was investigated. The protocols described here can be easily adapted to the study of any bacterial species of interest.

This report describes protocols for characterizing interactions between bacterial outer membrane proteins and the human complement regulator vitronectin. The protocols can be used to study the binding reactions and biological function of vitronectin in any bacterial species.

Vitronectin 在细菌黏附和血清耐药性中作用的实验研究

Bacteria utilize complement regulators as a means of evading the host immune response. Here, we describe protocols for evaluating the role vitronectin ...

Detection of Antibodies That Neutralize the Cellular Uptake of Enzyme Replacement Therapies with a Cell-based Assay

The administration of enzyme replacement therapies (ERTs) and other biologic therapies to patients may elicit an anti-drug immune response. The characterization of these anti-drug antibodies (ADA), especially those that may neutralize the biological activity of the drug, termed neutralizing antibodies (NAbs), is crucial in understanding the effects of these antibodies on the drug&#39;s pharmacological profile. This protocol describes a cell-based flow cytometry method to detect factors that neutralize the cellular uptake of a representative lysosomal ERT in human matrix. The protocol consists of three procedures: screening, a confirmatory step, and titer assays to detect, identify, and establish the relative level of neutralizing antibody titer in subject samples.
In this method, samples are first mixed with the fluorophore-conjugated ERT product, then incubated with cells [e.g., human T lymphocytes (Jurkat cells)] that express a cell-surface cation-independent mannose 6-phosphate receptor (CI-M6PR), and finally, analyzed with a flow cytometer. A sample without NAbs will result in the uptake of the fluorophore-conjugated ERT product via CI-M6PR, whereas, the presence of NAbs will bind to the drug and interfere with the CI-M6PR binding and uptake. The amount of the fluorophore-conjugated ERT internalized by the Jurkat cells is measured by flow cytometry and evaluated as the percentage (%) signal inhibition compared to the response obtained in the presence of a representative drug-na&#239;ve matrix. In the confirmatory step, the samples are pre-incubated with ERT-conjugated magnetic beads to deplete drug-specific factors that bind to the drug (such as NAbs) prior to an incubation with cells. Samples that screen and confirm positive for drug-specific NAbs in the assay are then serially diluted to generate an antibody titer. Semi-quantitative antibody titers may be correlated with measurements of drug safety and efficacy.

Here we present a cell-based flow cytometry method to detect neutralizing antibodies or other factors that interfere with the cellular uptake of enzyme replacement therapies in a human matrix, such as cerebral spinal fluid (CSF) or human serum.

细胞法检测酶替代疗法中细胞吸收的抗体

The administration of enzyme replacement therapies (ERTs) and other biologic therapies to patients may elicit an anti-drug immune response. The ...

A High-throughput Platform for the Screening of Salmonella spp./Shigella spp.

Fecal-oral transmission of acute gastroenteritis occurs from time to time, especially when people who handled food and water are infected by Salmonella spp./Shigella spp. The gold standard method for the detection of Salmonella spp./Shigella spp. is direct culture but this is labor-intensive and time-consuming. Here, we describe a high-throughput platform for Salmonella spp./Shigella spp. screening, using real-time polymerase chain reaction (PCR) combined with guided culture. There are two major stages: real-time PCR and the guided culture. For the first stage (real-time PCR), we explain each step of the method: sample collection, pre-enrichment, DNA extraction and real-time PCR. If the real-time PCR result is positive, then the second stage (guided culture) is performed: selective culture, biochemical identification and serological characterization. We also illustrate representative results generated from it. The protocol described here would be a valuable platform for the rapid, specific, sensitive and high-throughput screening of Salmonella spp./Shigella spp.

A High-throughput Platform for the Screening of Salmonella spp./Shigella spp.

Salmonella spp./Shigella spp. are common pathogens attributed to diarrhea. Here, we describe a high-throughput platform for the screening of Salmonella spp./Shigella spp. using real-time PCR combined with guided culture.

沙门氏菌筛选的高通量平台.

Fecal-oral transmission of acute gastroenteritis occurs from time to time, especially when people who handled food and water are infected by Salmonella ...

环介导等温扩增（LAMP）法进行的物种特异性检测

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