4. HIV-1 RNA viral load (VL) consistently less than 400 copies/mL for six months or longer prior to enrollment (as reported by the subject). Documentation must include the following: at least one documented HIV RNA PCR result showing VL less than 400 copies/mL obtained between 12-36 weeks prior to enrollment at any laboratory used by a health care facility and another VL less than 50 copies/mL that must be obtained at the NIH Clinical Center within 28 days prior to study entry.