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Impact on the immune system of undetectable plasma HIV-1 RNA for more than 2 years.

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Results: A significant increase was noted in CD4+ lymphocyte counts at the end of the study in HIV-1-positive patients. In addition, the CD4: CD8 ratio rose significantly with respect to baseline, although it remained lower than in the controls. CD45RA+ and CD45RO+ population percentages did not differ between groups. A significant rise in CD45RA+ T cells was observed. Analysis of T-cell activation measuring the expression of human leukocyte antigen-DR and CD25 did not differ between groups. The proportion of CD8+ lymphocytes that were CD28+ was similar in both groups at the end of the follow-up. T-cell receptor Vbeta subfamily analysis showed that an expansion of the T-cell receptor repertoire might occur in these patients.

Conclusion: A significant increase was noted in CD4+ lymphocyte counts at the end of the study in HIV-1-positive patients. In addition, the CD4: CD8 ratio rose significantly with respect to baseline, although it remained lower than in the controls. CD45RA+ and CD45RO+ population percentages did not differ between groups. A significant rise in CD45RA+ T cells was observed. Analysis of T-cell activation measuring the expression of human leukocyte antigen-DR and CD25 did not differ between groups. The proportion of CD8+ lymphocytes that were CD28+ was similar in both groups at the end of the follow-up. T-cell receptor Vbeta subfamily analysis showed that an expansion of the T-cell receptor repertoire might occur in these patients.

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