3. CD4+ cell count greater than 350 cells/mm(3) at 2 different time points that meet the following criteria: The first result must be from between 4 weeks to 36 weeks prior to enrollment obtained at any laboratory used by a health care facility. The second result must be obtained at the NIH Clinical Center within 28 days prior to enrollment. There must be at least 28 days between the two tests used for eligibility.