"Of the estimated 14.0 million (range: 11.2 million to 22.0 million) people who inject drugs worldwide, UNODC estimates that 1.6 million (range: 1.2 million to 3.9 million) are living with HIV. That represents a global prevalence of HIV of 11.5 per cent among people who inject drugs.15
"Along with the estimates of the total number of people who inject drugs, the global total and prevalence rates of people who inject drugs living with HIV for 2011 is also lower than the estimated 3 million (18.9 per cent prevalence among people who inject drugs) previously presented by the Reference Group to the United Nations on HIV and Injecting Drug Use for 2008. These reduced estimates are in large part a result of the availability of more reliable information on HIV prevalence among people who inject drugs."
UNODC, World Drug Report 2013 (United Nations publication, Sales No. E.13.XI.6), p. 5.