- The CD4 cell count must be 201 - 799 cells/mm3 measured on two separate occasions within 60 days at least 72 hours apart prior to study entry (at least 1 of 2 counts and the mean must be < 800 cells/mm3, and at least 1 of 2 counts and the mean must be > 200 cells/mm3). The last count must be within 14 days of study entry.