The aim of the study was to evaluate the trends of initial CD4+ T-cell counts (CD4+) at HIV diagnoses and to identify the factors influencing the annual changes of CD4+ cell counts in Korea during 1988-2006. As a retrospective study, 2613 individuals (>/=15 years at diagnosis, their CD4+ counts were measured within six months) were selected from all 4580 HIV-infected Koreans diagnosed between 1985 and 2006. The mean CD4+ cell counts in all the selected individuals was 312 cells/mm(3), and this value decreased significantly by 20.3 cells/mm(3)/year over the 19 year study period. Men had lower CD4+ cell count than women by 22.7 cells/mm(3), and age at HIV diagnosis had an inverse relationship with CD4+ cell counts of 23.5 cells/mm(3) lower per 10 years advancing age. Cases diagnosed in hospitals showed CD4+ cell count levels 33.9 cells/mm(3) lower than public institutions by 33.9 cells/mm(3). Gender and age seemed to affect trends of CD4+ count; however the institution where cases were diagnosed had the strongest effect on decreasing CD4+ cell counts. The results suggest that HIV diagnoses in recent years are being made in later stages of HIV infection and that it is imperative to develop more efficient programmes for early HIV diagnosis to prevent transmission.
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