In all regions of the world, people who inject drugs are disproportionately affected by HIV.1 Globally, people who inject drugs are 28 times more likely to be living with HIV than the general population. The United Nations Office on Drugs and Crime (UNODC), the World Health Organization (WHO), the Joint United Nations Programme on HIV/AIDS (UNAIDS) and the World Bank estimate that worldwide as of 2014, about 11.7 million2 people inject drugs, of whom an estimated 14% (1.6 million) are living with HIV.3 Injecting drug use accounts for 30% of new HIV infections outside sub- Saharan Africa. People who inject drugs also have higher rates of hepatitis C (HCV) and tuberculosis than the general population. The global rate of HCV among people who inject drugs is 52%, greatly surpassing even the high prevalence of HIV among them.