Differential analysis of human immunodeficiency virus-related antibody detected by enzyme linked immunosorbent assay and western blot
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摘要: 目的 探讨酶联免疫吸附测定(ELISA)与免疫印迹试验(WB)在人类免疫缺陷病毒(HIV)抗体检测中的差异性。 方法 选取陕西省铜川地区进行HIV抗体检测的疑似HIV感染患者105例为研究对象,初筛后进行ELISA、反转录聚合酶链反应(RT-PCR)复核检测后再经WB验证。分析初筛后ELISA、RT-PCR复核检测结果与WB验证结果的差异性。比较ELISA检测得出的质控物吸光度值与临界值的比值(S/CO)与WB验证结果的差异,并观察WB反应带型结果。 结果 105例疑似HIV感染患者ELISA、RT-PCR复核检测结果显示,双阳性98例,WB验证后显示阳性87例,符合率为88.78%(87/98)。ELISA检测结果为阳性但RT-PCR检测为阴性的样本经WB验证后确定阳性1例,符合率为20.00%(1/5)。ELISA检测得出的S/CO值<1及S/CO值≥10时与WB验证结果的符合率最高。WB证实为阳性的87例样本中,gp160、gp120出现率均为100.00%,gp41、p24、p17出现率分别为95.40%(83/87)、64.37%(56/87)、56.32%(49/87), 另有2.30%(2/87)显示无HIV抗体特异带。 结论 ELISA、WB用于HIV抗体检测均具有一定价值,对复核检测结果采用WB验证可提高诊断符合率,但WB验证后的样本中亦存在阴性或不确定性样本,因此应对此类患者进行重点追踪并实施进一步检测。Abstract: Objective To investigate the difference of enzyme linked immunosorbent assay(ELISA)and western blotting(WB)in detection of human immunodeficiency virus(HIV)antibody. Methods HIV antibody detections were performed for 105 suspected HIV-infected patients in areas of Tongchuan City of Shaanxi Province, after the initial screening by ELISA and recheck of reverse transcription-polymerase chain reaction(RT-PCR), the results were re-verified by WB. The differences between result of early screening by detection of ELISA as well as recheck of RT-PCR and WB verification, and between ratio of the absorbance value to cut-off value(S/CO)of ELISA detection and results of WB verification were analyzed. Result of reaction band type of WB test was observed. Results Out of 105 suspected HIV-infected patients, 98 cases were diagnosed as double positive findings detected by ELISA and RT-PCR, and 87 positive cases were confirmed as HIV infection by WB, with a coincidence rate of 88.78%(87/98). In patients with positive results by ELISA but negative results by RT-PCR, one case was confirmed as positive result by WB, with a coincidence rate of 20.00%(1/5). The coincidence rates were the highest when S/CO value<1 and S/CO≥10 obtained by ELISA test compared with the WB verification result. Among the 87 positive samples confirmed by WB, the occurrence rates of gp160 and gp120 reached 100.00%, followed by gp41, p24 - and p17, with their occurrence rates of 95.40, 64.37% and 56.32%, respectively, and another 2.30% samples showed no specific HIV antibody band. Conclusion Both ELISA and WB detection can improve the coincidence rate of HIV antibody detection. However, there are negative or uncertain samples after WB validation. Therefore, such patients should be tracked and given further testing.
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