The interpretation of HIV-1 antibody results in infants who are born to HIV-infected mothers may be difficult because maternal immunoglobulin G (IgG) crosses the placenta. These maternal antibodies can persist for as long as 15 months.[2,9] For this reason, virtually all infants born to ELISA/WB-positive mothers are also ELISA/WB positive.[9] In this situation, other tests are required to determine HIV status. Recommended tests include serial HIV antibody testing of infants up to 15 months of age, p24 antigen testing, and PCR testing.[2,9] PCR is considered the most useful test for determining HIV status in newborns.[10-14] The PCR test itself, when done at 1 month of age or after, has a sensitivity of 95% to 97% and a specificity of 98.6% to 100%.[4,10,12,14]