CD4 and infection: Analysis of the demographic variables revealed that, compared with other patients, a significantly lower rate of durable viral suppression were observed in patients who were female, under 20 years of age, had a senior high school degree or lower, whose risk factor was being an IDU, resided in eastern Taiwan, received treatment at local hospitals, experienced interrupted care, lacked continual care, had CD4 levels below 350 cell/mm3 at the beginning of this study, reported infection before 2010, and had a history of drug resistance (Table 1).