The results of serologic examination of 314 children born by HIV-positive mothers were presented. It was found that probability of disappearance of mothers’ antibodys in non-infected children from HIV-positive mothers until 13 months is lower than probability of their presence. The probability of disappearance of mothers’ antibodys at the age of 18 months is 0.86, at the age of 19–21 months is near 1. Serologic examination of all children born from HIV-positive mothers at the age after 18 months (at 19–21 months) is most advisable.
