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. 2021 Jul 12;9:680867. doi: 10.3389/fpubh.2021.680867

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Copyright © 2021 Zhu, JiKe, Xu, Liang, Yu, Wang, Xiao, Liu, Chen, Guan, Liu and Jin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Principle of LAg-EIA. This graph indicates that after seroconvertion, the avidity of HIV-specific antibody increases along time and reaches a plateau after the mean duration time of recent infection. Enzyme immunoassay was performed to test the avidity of HIV-specific antibody, and the ODn value of test results can represent the avidity level. The recent infection is classified when ODn value is lower than the cut-off value, and the long-term infection is classified when ODn value is higher than the cut-off value.