CD4 and AIDS: These patients have been demonstrated to run a greater risk of AIDS progression [6–9] and death, particularly when CD4+ T-cell count is <200/μl.[4,10,11] A recent study has also demonstrated that patients unable to restore their CD4+ T-cell count to >200 cells/μl run a higher risk of death not only due to AIDS-defining diseases, but also due to non AIDS-defining causes.[12]