FIG. 1.

(A) Development of anti-V3 binding antibodies in six individuals (absorbance at 405 nm [Abs₄₀₅] versus weeks postinfection). Binding of each serum to the autologous peptides is shown in black, with binding to heterologous peptides shown in gray. (B) Peptide adsorption neutralization assays. Sera were preincubated with autologous V3 peptides (black) or irrelevant peptides (gray) prior to performing neutralization assays against the autologous enrollment virus. Neutralization titer (ID₅₀) is plotted against the number of weeks p.i.