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Vietnam’s HIV epidemic is concentrated among high risk behaviour population such as female sex worker (FSW), people who injecting drug (PWID) and Men who having sex with men (MSM). HIV prevalence among PWID was reported to be high as 10.3% compared to under 0.3% among general population [17]. In VietNam, the estimated number of PWID was 270,000 people in 2013. Of the 224,000 PLWHIV in 2013, 39% were PWID. MMT has been initiated since 2008 in Haiphong and Ho Chi Minh City [16]. By the year 2013, MMT programmes encompassed 88 clinics, covering 33 (out of 63) provinces, and serving 15,542 PWID [17].

Factors determining dropping out from treatment among methadone clients: a qualitative study in Can Tho City, Vietnam