The variables selected for being associated with a virologic response in the univariate analysis were: gender; sexual orientation; living with a family member/partner; comorbidity; clinical situation; hospitalization for AIDS-defining illness before ART; hospitalization for AIDS-defining illness after initiating ART; disease after initiating ART; treatment adherence failure; CD4 count when initiating ART (Table 1). The gene discussed is CD4; the disease is AIDS.