TABLE 2.

Autologous neutralizing antibody titers induced by each immunogen over time^a

^aThe TZM-bl assay was performed at the Academic Medical Center (AMC). ID₅₀ values are shown and colored according to their magnitude. White, ID₅₀ < 20; gray, 20 < ID₅₀ < 40; yellow, 40 < ID₅₀ < 100; orange, 100 < ID₅₀ < 1,000; red, ID₅₀ > 1,000.