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Copro-antigen capture ELISA for the detection of Teladorsagia (Ostertagia) circumcincta in sheep: improvement of specificity by heat treatment

机译:辅助抗原捕获酶联免疫吸附测定(ELISA)用于检测绵羊的圆头蛇ador(Ostertagia)的包皮炎:通过热处理提高特异性

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摘要

A copro-antigen capture ELISA for the detection of Teladorsagia circumcincta infection in sheep was developed and evaluated. Experiments with faeces from worm-free sheep, that had been spiked with known concentrations of excretory-secretory (E–S) antigen indicated that a positive signal was generated with 180 ng of E–S/ml. A nested design, based on 8 infected and 8 worm-free sheep, was employed to assess the stages during sample preparation contributing to variation in signal from the assay. This showed that 87% of the variance in the optical density readings (ODs) was directly explained by infection status. Variation between individual sheep within infection groups, and between samples at various stages in the assay, collectively accounted for the remaining variance. Initial evaluation of specificity using faeces from animals carrying a range of monospecific infections indicated cross-reactivity with Haemonchus contortus and Nematodirus spathiger. However, by treating the supernatant from faeces for 20 min at 100°C, the cross-reactive signal was eliminated whilst the specific signal was largely preserved. Heat treatment of faeces from 12 non-infected sheep, 12 sheep with T. circumcincta and 6 with H. contortus resulted in sensitivity being increased from 66.7 to 85.7%, and specificity from 62.5 to 87.5%. OD values showed a significant positive relationship with adult worm burdens, although at low infection intensities there was some overlap between infected and worm-free animals. We discuss the application of CC-ELISAs in facilitating selective chemotherapy of sheep, as a means of avoiding the development of anthelmintic resistance in pastoral regions where sheep are farmed on a large scale.
机译:开发并评估了一种用于检测绵羊外周血Teladorsagia circumcincta感染的辅助抗原捕获ELISA。对来自无虫绵羊的粪便进行的实验已经掺入了已知浓度的排泄-分泌(ES)抗原,结果表明以180 ng的E–S / ml产生了阳性信号。采用基于8只受感染的羊和8只无蠕虫的羊的嵌套设计来评估样品制备过程中的阶段,这有助于分析信号的变化。这表明光密度读数(ODs)的87%的变化直接由感染状态引起。感染组内各个绵羊之间的差异,以及测定中各个阶段样品之间的差异共同说明了剩余的差异。使用携带多种单特异性感染动物粪便的粪便对特异性进行的初步评估表明,该病菌与捻转血矛线虫和刺线虫有交叉反应。但是,通过将粪便中的上清液在100°C下处理20分钟,可以消除交叉反应信号,同时很大程度上保留了特定信号。热处理来自12只未感染绵羊,12只绵羊带有环线菌和6个山羊带捻丝菌的粪便,其敏感性从66.7增至85.7%,特异性从62.5增至87.5%。 OD值与成虫蠕虫负担呈显着正相关,尽管在低感染强度下,感染和无蠕虫的动物之间存在一些重叠。我们讨论了CC-ELISAs在促进绵羊选择性化学治疗中的应用,作为避免大规模种植绵羊的牧区产生驱虫抗药性的手段。

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