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nAbs titers in different groups (PLWH were divided into three groups: CD4 cell count < 200/μL, CD4 cell count between 200 and 500/μL and CD4 cell count ≥ 500/μL). P < 0.05, nAbs titers in PLWH were significantly different from HNCs; P < 0.01, nAbs titers in PLWH with CD4 cell count < 200/μL were differ from those in PLWH with CD4 cell count ≥ 500/μL; P > 0.05, there were no significantly difference between the groups; P-values were computed using the Mann–Whitney U-test
