CD4 and infection: The multivariate logistic regression model showed that infection through intravenous drug use, a CD4+ T cell count between 200 and 499 cells/mm3, and CRF07_BC or CRF55_01B were important factors, with aORs of 0.266 (95% CI 0.144–0.493), 1.339 (1.095–1.636), 3.435 (2.789–4.232) and 2.498 (95% CI 1.850–3.372), respectively (Table 3).