In our base case analysis, in which we assumed that all individuals in each setting were tested at the median CD4 count for that setting, 429 cells/μL for STD clinics, 356 cells/μL for EDs, and 36 cells/μL for inpatient settings, there were no changes in QALYs between the ED and STD clinic settings (Table 3), given that index patients in both the ED and STD clinics initiated HAART at the same time following infection, i.e., when their CD4 counts decreased to 350 cells/μL. This evidence concerns the gene CD4 and infection.