Confirmatory testing of 120 positive HIV antibody screening samples in Lanxi City
XU Yahua1, WU Bin2
1. Department of Microbiology, Lanxi Center for Disease Control and Prevention, Lanxi, Zhejiang 321100, China; 2. Jinhua Center for Disease Control and Prevention, Jinhua, Zhejiang 321002, China
Abstract：Objective To analyze the confirmatory test results of 120 positive HIV antibody screening samples in Lanxi City, Zhejiang Province, so as to provide insights into AIDS detection and control. Methods Western blotting confirmatory assay was performed on 120 positive HIV antibody samples from HIV screening laboratories in Lanxi City from 2020 to 2022. The confirmatory test results were determined according to the “National Technical Guidelines for AIDS Testing (2020 revision)” and “Diagnosis for HIV/AIDS” (WS 293-2019), and the positive rate of confirmatory test and band distribution were analyzed. Results Among 120 positive HIV antibody screening samples, there were 100 HIV-1 antibody positive samples (83.33%) as revealed by Western blotting confirmatory assay, 6 HIV antibody negative samples (5.00%), and 14 HIV-1 indeterminate tests (11.67%). There were 72 men and 28 men tested positive for HIV-1 antibody, with a male to female ratio of 2.57∶1, and there were 88 patients at ages of 20 to 59 years (88.00%), with the highest frequency of gp160, gp120 and p24 bands (100.00%). The most common Western blotting band pattern was p24 among HIV-1 indeterminate tests (78.57%). Among all HIV-1 indeterminate Western blotting tests, 6 cases were tested positive for HIV-1 antibody (gp160+p24) and 8 cases tested negative for HIV antibody during the follow-up period. Conclusions The prevalence of HIV-1 antibody was 83.33% in 120 positive HIV antibody screening samples in Lanxi City. The three most common Western blotting band patterns were gp160, gp120 and p24. The follow-up requires to be reinforced in HIV-1 indeterminate Western blotting tests for early identification and early intervention.
