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Immunochromatographic test and ELISA for the detection of glutamate dehydrogenase (GDH) and A/B toxins as an alternative for the diagnosis of Clostridioides (Clostridium) difficile–associated diarrhea in foals and neonatal piglets
Brazilian Journal of Microbiology ( IF 2.2 ) Pub Date : 2020-05-03 , DOI: 10.1007/s42770-020-00275-4
Carolina Pantuzza Ramos 1 , Emily Oliveira Lopes 1 , Carlos Augusto Oliveira Júnior 1 , Amanda Nádia Diniz 1 , Francisco Carlos Faria Lobato 1 , Rodrigo Otávio Silveira Silva 1
Affiliation  

Considering the lack of studies evaluating the performance of commercially available methods for diagnosis of Clostridioides ( Clostridium ) difficile infection (CDI) in animals, the present study aimed to assess an immunochromatographic test for detection of glutamate dehydrogenase (GDH) and A/B toxins of C . difficile , also evaluated by an ELISA kit, in foals and neonatal piglets. Intestinal contents of 47 piglets and feces of 35 foals were tested to GDH antigen and A/B toxins in a lateral flow method (Ecodiagnostica, Brazil). Also, these samples were submitted to A/B toxin detection by an ELISA kit ( C . difficile Tox A/B II, Techlab Inc., USA), using the toxigenic culture (TC) as the reference method. The GDH component of the lateral flow test showed sensitivity and negative predictive value (NPV) of 100% and a high specificity in samples of piglets (82.61%) and foals (100%). Detection of A/B toxins using the lateral flow test and the ELISA resulted in a specificity of 100% in samples of both species. On the other hand, the sensibility ranged from 54.2 to 90% for the ELISA and from 12.5 to 60% for the lateral flow test for piglets’ and foals’ samples, respectively. In conclusion, the present work suggests that the lateral flow test for GDH detection could be a useful method for diagnosing CDI in these species. On the other hand, the low sensitivity of the lateral flow test for A/B toxins might compromise its utility in piglets.

中文翻译:

免疫层析试验和 ELISA 检测谷氨酸脱氢酶 (GDH) 和 A/B 毒素,作为诊断马驹和新生仔猪艰难梭菌相关性腹泻的替代方法

考虑到缺乏评估用于诊断动物艰难梭菌感染 (CDI) 的市售方法的性能的研究,本研究旨在评估用于检测谷氨酸脱氢酶 (GDH) 和 A/B 毒素的免疫色谱测试C 。difficile 也通过 ELISA 试剂盒在小马驹和新生仔猪中进行了评估。47 头小猪的肠道内容物和 35 头小马驹的粪便以侧向流法(Ecodiagnostica,巴西)检测 GDH 抗原和 A/B 毒素。此外,这些样品通过ELISA试剂盒(艰难梭菌Tox A/B II,Techlab Inc.,USA)进行A/B毒素检测,使用产毒培养物(TC)作为参考方法。横向流动测试的 GDH 组件显示出 100% 的灵敏度和阴性预测值 (NPV),并且在仔猪 (82.61%) 和小马驹 (100%) 样本中具有高特异性。使用侧向流动测试和 ELISA 检测 A/B 毒素导致两种物种样品的特异性均为 100%。另一方面,ELISA 的敏感性为 54.2% 至 90%,仔猪和马驹样品的侧向流动测试的敏感性分别为 12.5% 至 60%。总之,目前的工作表明,用于 GDH 检测的横向流动测试可能是诊断这些物种 CDI 的有用方法。另一方面,A/B 毒素横向流动测试的低灵敏度可能会影响其在仔猪中的效用。使用侧向流动测试和 ELISA 检测 A/B 毒素导致两种物种样品的特异性均为 100%。另一方面,ELISA 的敏感性为 54.2% 至 90%,仔猪和马驹样品的侧向流动测试的敏感性分别为 12.5% 至 60%。总之,目前的工作表明,用于 GDH 检测的横向流动测试可能是诊断这些物种 CDI 的有用方法。另一方面,A/B 毒素横向流动测试的低灵敏度可能会影响其在仔猪中的效用。使用侧向流动测试和 ELISA 检测 A/B 毒素导致两种物种样品的特异性均为 100%。另一方面,ELISA 的敏感性为 54.2% 至 90%,仔猪和马驹样品的侧向流动测试的敏感性分别为 12.5% 至 60%。总之,目前的工作表明,用于 GDH 检测的横向流动测试可能是诊断这些物种 CDI 的有用方法。另一方面,A/B 毒素横向流动测试的低灵敏度可能会影响其在仔猪中的效用。目前的工作表明,用于 GDH 检测的横向流动测试可能是诊断这些物种 CDI 的有用方法。另一方面,A/B 毒素横向流动测试的低灵敏度可能会影响其在仔猪中的效用。目前的工作表明,用于 GDH 检测的横向流动测试可能是诊断这些物种 CDI 的有用方法。另一方面,A/B 毒素横向流动测试的低灵敏度可能会影响其在仔猪中的效用。
更新日期:2020-05-03
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