Background:This study was planned to assess the accuracy and comparability of two commercially available,laboratory-based SARS-CoV-2(severe acute respiratory syndrome)antigen(Ag)immunoassays.Methods:We studied a cohor...Background:This study was planned to assess the accuracy and comparability of two commercially available,laboratory-based SARS-CoV-2(severe acute respiratory syndrome)antigen(Ag)immunoassays.Methods:We studied a cohort of subjects with acute SARS-CoV-2 infection,from whom a nasopharyngeal swab was taken and tested with a molecular assay(Altona Diagnostics RealStar SARS-CoV-2 RT-PCR Kit)and two laboratory-based,fully automated SARS-CoV-2 Ag immunoassays(Fujirebio Lumipulse G SARS-CoV-2 Ag and Roche Elecsys SARS-CoV-2 Ag).Results:The final population consisted in 93 subjects testing positive for SARS-CoV-2 RNA,34 with cycle threshold(Ct)values<29.5.The results of the two SARS-CoV-2 Ag immunoassays were significantly intercorrelated(r=0.77;P<0.001)in the entire cohort,though such correlation considerably improved in patients with high viral load(cycle threshold values<29.5:r=0.96;P<0.001).The accuracy for identifying samples with high viral load was excellent for both Lumipulse G SARS-CoV-2 Ag(AUC,0.99;P<0.001)and Elecsys SARS-CoV-2 Ag(AUC,0.99;P<0.001),with best cut-offs of 2.03 ng/mL for Lumipulse G SARS-CoV-2 Ag(1.00 sensitivity and 0.88 specificity)and 0.70 COI for Elecsys SARS-CoV-2 Ag(1.00 sensitivity and 0.80 specificity),respectively.Conclusion:The results of this study provide valuable support to usability of fully-automated,rapid,high throughput and accurate SARS-CoV-2 Ag immunoassays for complementing molecular assays.展开更多
食品安全已成为一个重要的公共卫生问题,快速、准确地监测和检测食源性致病菌是控制和预防人类食源性疾病的最有效方法之一。由于食品基质的复杂性、细菌的多样性及不同生长和复制特性,给食源性致病菌检测带来了重大挑战。传统微生物检...食品安全已成为一个重要的公共卫生问题,快速、准确地监测和检测食源性致病菌是控制和预防人类食源性疾病的最有效方法之一。由于食品基质的复杂性、细菌的多样性及不同生长和复制特性,给食源性致病菌检测带来了重大挑战。传统微生物检测方法耗时费力,不足以满足不可培养活菌细胞和现场快速食品检测的要求。因此,近年来针对食源性致病菌开发了各种免疫检测技术,比传统方法更加灵敏、简单和高效,具有广阔的应用前景。该文结合食源性致病菌亚致死损伤、活的不可培养(viable but non-culturable,VBNC)和休眠3种代谢状态的生物学特征及抗体的类型和特点,综述了当前用于食源性致病菌常见的免疫技术的检测原理、优缺点和应用,并对现有方法的局限性和未来发展方向进行讨论,以期为食源性致病菌免疫检测技术的开发和利用提供参考。展开更多
文摘Background:This study was planned to assess the accuracy and comparability of two commercially available,laboratory-based SARS-CoV-2(severe acute respiratory syndrome)antigen(Ag)immunoassays.Methods:We studied a cohort of subjects with acute SARS-CoV-2 infection,from whom a nasopharyngeal swab was taken and tested with a molecular assay(Altona Diagnostics RealStar SARS-CoV-2 RT-PCR Kit)and two laboratory-based,fully automated SARS-CoV-2 Ag immunoassays(Fujirebio Lumipulse G SARS-CoV-2 Ag and Roche Elecsys SARS-CoV-2 Ag).Results:The final population consisted in 93 subjects testing positive for SARS-CoV-2 RNA,34 with cycle threshold(Ct)values<29.5.The results of the two SARS-CoV-2 Ag immunoassays were significantly intercorrelated(r=0.77;P<0.001)in the entire cohort,though such correlation considerably improved in patients with high viral load(cycle threshold values<29.5:r=0.96;P<0.001).The accuracy for identifying samples with high viral load was excellent for both Lumipulse G SARS-CoV-2 Ag(AUC,0.99;P<0.001)and Elecsys SARS-CoV-2 Ag(AUC,0.99;P<0.001),with best cut-offs of 2.03 ng/mL for Lumipulse G SARS-CoV-2 Ag(1.00 sensitivity and 0.88 specificity)and 0.70 COI for Elecsys SARS-CoV-2 Ag(1.00 sensitivity and 0.80 specificity),respectively.Conclusion:The results of this study provide valuable support to usability of fully-automated,rapid,high throughput and accurate SARS-CoV-2 Ag immunoassays for complementing molecular assays.
文摘食品安全已成为一个重要的公共卫生问题,快速、准确地监测和检测食源性致病菌是控制和预防人类食源性疾病的最有效方法之一。由于食品基质的复杂性、细菌的多样性及不同生长和复制特性,给食源性致病菌检测带来了重大挑战。传统微生物检测方法耗时费力,不足以满足不可培养活菌细胞和现场快速食品检测的要求。因此,近年来针对食源性致病菌开发了各种免疫检测技术,比传统方法更加灵敏、简单和高效,具有广阔的应用前景。该文结合食源性致病菌亚致死损伤、活的不可培养(viable but non-culturable,VBNC)和休眠3种代谢状态的生物学特征及抗体的类型和特点,综述了当前用于食源性致病菌常见的免疫技术的检测原理、优缺点和应用,并对现有方法的局限性和未来发展方向进行讨论,以期为食源性致病菌免疫检测技术的开发和利用提供参考。