Children younger than 24 months of age must not have had plasma HIV-1 RNA levels greater than 8 X 10(4) copies/ml previously and at the time of initial evaluation, confirmed at least at two different time points 2 to 4 weeks apart, showing no sign of increase (increment less than 0.5 log(10). If the child has had plasma HIV-1 RNA levels greater than 8 X 10(4) copies/ml at some point prior to the initial evaluation, he/she will have to be placed on antiretroviral treatment and must meet all the criteria for Arm B.