CD4 and sexually transmitted disease: In six (BBH, CD4 HIV/ART, Fraser, Goals, HIV Portfolio, and STDSIM) out of eleven models (excluding STI-HIV Interaction) this was not the case: increasing eligibility from CD4≤350 cells/μl to immediate initiation always required more person-years of treatment, even with “perfect" ART programmes (100% access and 100% retention).