Determining the longevity and dynamics of HIV-1 neutralizing activity

The induction of neutralizing antibodies is the main goal of an HIV-1 vaccine, although data on the longevity of such antibodies is lacking. By tracking neutralizing antibodies in a large cohort of individuals infected with HIV-1 who had varying viral loads, we show that the HIV-1 neutralization response can last for several years even at low antigen levels.