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: Little is known about the efficiency of vertical transfer of HIV-1-specific antibodies. Antibody levels in plasma from 60 mother-infant pairs near the time of birth, including 14 breast-feeding transmission pairs, were compared. The envelope-binding titers were strongly correlated (r = 0.91, P &lt; 0.0001) and similar (1.4-fold greater in maternal plasma) between a mother and her corresponding infant as were the neutralizing antibody (Nab) levels (r = 0.80, P &lt; 0.0001; 1.3-fold higher), suggesting efficient transfer. There was no significant difference in Nab responses between transmitting and nontransmitting mothers, although there was a trend for transmitting mothers to have higher HIV-1-specific Nabs.

journal of acquired immune deficiency syndromes

Evidence for Efficient Vertical Transfer of Maternal HIV-1 Envelope–Specific Neutralizing Antibodies but No Association of Such Antibodies With Reduced Infant Infection