Evaluating the Value of Anti-SARS-CoV-2 Antibody Detection and Neutralizing Responses With Euvirus: A Population of 10776 Close Contacts in Delta Variant Epidemic of Fujian

Nucleic acid detection represents limitations due to its high false-negative rate and technical complexity in the COVID-19 pandemic. Anti-severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody tests are widely spread all over the world presently. However, there is no report on the effectiveness of anti-SARS-CoV-2 antibody testing methods in China. Here, we gathered 10776 serum samples from close contacts of the SARS-CoV-2 infections in Fujian of China and used two chemiluminescence immunoassays (Wantai bio., Xiamen, China, and Yahuilong bio., Shenzhen, China) and two lateral flow immunoassays (Lizhu bio., Zhuhai, China and Dongfang bio., Zhejiang, China) to perform the anti-SARS-CoV-2 antibody tests in China. The results show that the four antibody tests have great diagnostic value for infected or uninfected, especially in the neutralizing antibodies tests, the AUC can reach 0.939 (Wantai bio.) and 0.916 (Yahuilong bio.). Furthermore, we used pseudoviruses and euvirus neutralization assay to validate the effectiveness of these antibody test, the results of pseudoviruses neutralization assay or euvirus neutralization assay shows a considerable correlation with the 4 antibody detection respectively, particularly in euvirus neutralization assay, neutralizing antibodies detected by Wantai bio. or Yahuilong bio., the correlation can get the level of 0.93 or 0.82. The findings of this study demonstrate that the detections of antibodies have profound value in the diagnosis of COVID-19.Funding Information: None to declare. Declaration of Interests: We declare that we have no conflicts of interest.Ethics Approval Statement: This study was approved by the Joint Prevention and Control Mechanism of the State Council