Viremia variability correlation between patients who retained and lost anti-CCR5 Abs during follow-up period. Individual regression curves were compared between LTNP subjects changing (A) or maintaining (B) anti-CCR5 Abs. Samples were evaluated at the time of entry and at least twice during 3 years of follow-up. Median slope values per each group of LTNPs are shown. Analysis was performed by the Mann-Whitney test.