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A positive antibody test in a child younger than 18 months of age indicates only that the mother is infected, because maternal immunoglobulin G antibodies persist in infants for 6 to 9 months and, in some cases, as long as 18 months. A positive enzyme-linked immunosorbent assay (ELISA) does not indicate true HIV infection.

A positive antibody test in a child younger than 18 months of age indicates only that the mother is infected, because maternal immunoglobulin G antibodies persist in infants for 6 to 9 months and, in some cases, as long as 18 months. A positive enzyme-linked immunosorbent assay (ELISA) does not indicate true HIV infection.

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