Model 2: After adjusting sex, age, occupation, marital status, route of HIV infection, duration of ART, initial ART regimens, ART regimens at survey, and missed doses, patients with VL 201–999 copies/mL and DR, VF and no DR, VF and DR had higher detection rates of CD4 cell counts < 200 cells/μL, compared with VL 50–200 copies/mL and no DR (Table 2). Here, CD4 is linked to HIV infectious disease.