 - Screening plasma HIV RNA levels below level of detection 50 copies RNAmL using Roche Amplicor or 75 copiesmL using Bayer bDNA or 40 copiesmL using Abbott RT-PCR, and all available determinations in past 12 months also below level of detection isolated single values 75 but 1000 copiesmL will be allowed if they were preceded and followed by undetectable viral load determinations. 