<prompt> All of the following methods are used for the diagnosis of HIV infection in a 2 month old child,DNA-PCR.Viral culture.HIV ELISAp24 antigen assay  <response>: Anti-HIV antibody detection by ELISA or any other method is done only after 18 months of birth when all maternal antibodies would have disappeared.HIV diagnosis 18 months: i HIV DNA detection best, ii p-24 antigen, iii HIV RNA detection, iv virus isolation 