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The evolution of autologous neutralizing antibodies to sequential human immunodeficiency virus type 1 (HIV-1) isolates was studied in a population of 16 children who were perinatally infected with human immunodeficiency virus type 1. The cohort included seven children with rapid disease progression (RP) and nine who had nonrapid disease progression (NRP). Four of the NRP after 6 months of age harbored...