- OKT4+ lymphocyte count greater than 300 cells/mm3 and less than 600 cells/mm3. The counts will be determined on three separate evaluations separated by at least 7 days between evaluations. These three counts will be averaged and for inclusion in the study the mean of the OKT4+ lymphocyte count must be greater than 200 cells/mm3 and less than 600 cells/mm3. Conclusion of screening tests: