Comparison of antimeasles and antipneumococcus antibody titers in uninfected and HIV-infected subjects. Antimeasles (A) and antipneumococcus (B) antibody titers were determined in plasma samples from 30 HIV-negative (controls), 26 PHI (16 in B), 40 CHI, and 7 LTNP subjects. The box plots for LTNP patients represents data from 7 subjects, each sampled 4 times, with an average of 2 years between samples. The ends of the boxes define the 25th and 75th percentiles, with a line at the median and error bars defining the 10th and 90th percentiles.