sentences:  Four different strains of HIV are believed to have originated from Burma, along heroin trafficking routes in northern, eastern and western Burma.Intravenous drug users (43%), along with miners (who often become infected through drug use) and sex workers (32%), are along the most likely to be infected with HIV.At least half of the 300,000 to 500,000 drug users (according to conservative estimates) in Burma are intravenous drug users, and Burma (Shan State and Kachin State) is a major regional supplier of heroin (with a major domestic shift from opium consumption to heroin consumption occurring in the late 1980s) and methamphetamines.