A prospective "test-and-treat" demonstration project among people who inject drugs in Vietnam.

Introduction: Modelling suggests that early diagnosis and immediate antiretroviral therapy (ART) among key populations would have a substantial impact in reducing HIV transmission and mortality in Vietnam. An implementation research project of "test-and-treat" among people who inject drugs (PWID) was developed to inform effective roll-out of such interventions.

Methods: "Test-and-treat" was offered to PWID in two high burden provinces, Thai Nguyen and Thanh Hoa.