Relationship between antimeasles ASCs, antimeasles antibody titers, and memory B-cell percentages in chronic HIV-1 infection. The strengths of association between (A) antimeasles antibody titers and anti-measles IgG ASCs per 10⁶ stimulated PBMCs, (B) antimeasles antibody titers and percentages of measles-specific memory B cells, and (C) memory B cells and anti-measles IgG ASCs were tested using the Spearman rank order correlation test. Figures represent scatter plots of the results of the correlation test, with corresponding regression lines. Percentages of measles-specific memory B cells in panel B were determined by dividing the number of anti-measles IgG ASCs by the number of total IgG ASCs.