A Low-Cost SARS-CoV-2 rRBD ELISA to Detect Serostatus in Ecuadorian Population with COVID-19.

A Low-Cost SARS-CoV-2 rRBD ELISA to Detect Serostatus in Ecuadorian Population with COVID-19.
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DOI:
10.4269/ajtmh.20-1420
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发表时间:
2021-02-25
期刊:
The American journal of tropical medicine and hygiene
影响因子:
--
通讯作者:
Coloma J
Coloma J
中科院分区:
其他
文献类型:
--
作者:
Guevara Á;Vivero S;Nipaz V;Guaraca V;Coloma J

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COVID-19的实验室诊断依赖于RT-PCR扩增SARS-CoV-2基因组的特定片段。然而,需要血清学测试来确定感染后引起的免疫反应。本研究采用RT-PCR方法对厄瓜多尔不同地区SARS-CoV-2(78例)、寨卡(20例)、登革热(20例)、基孔肯亚病(54例)、肠道寄生虫(11例)和艾滋病毒(1例)阳性者采集的恢复期血清进行分析,采用采用SARS-CoV-2受体结合域重组(rRBD)抗原的ELISA检测SARS-CoV-2感染引发的IgG抗体。在78份SARS-CoV-2 RT-PCR阳性样本中,73份比截止值高,5份为阴性。其他感染的所有检测血清均未显示出反应性。敏感性93.6%,特异性100%,阳性预测值100%,阴性预测值95.4%。这种内部抗IgG rRBD ELISA为检测SARS-CoV-2感染后的IgG免疫反应提供了一种经济且简单的替代方法。
Laboratory diagnosis of the COVID-19 relies on RT-PCR to amplify specific fragments of SARS-CoV-2 genome. However, serological tests are required to determine the immune response elicited after infection. Here, we analyzed convalescent sera collected from positive individuals by RT-PCR to SARS-CoV-2 (n = 78), Zika (n = 20), dengue (n = 20), chikungunya (n = 54), intestinal parasites (n = 11), and HIV (n = 1), from different areas of Ecuador, with an in-house ELISA using a SARS-CoV-2 receptor binding domain recombinant (rRBD) antigen to detect IgG antibodies elicited by SARS-CoV-2 infection. Of the 78 samples positive for SARS-CoV-2 by RT-PCR, 73 showed high absorbance value compared with the cutoff and five were negative. All tested sera from other infections showed no reactivity. Sensitivity, specificity, positive predictive value, and negative predictive value were 93.6%, 100%, 100%, and 95.4%, respectively. This in-house anti-IgG rRBD ELISA offers an economic and simple alternative to determine IgG immune responses after SARS-CoV-2 infection.
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