... knowledge andSTI signs. The same effect has been found in other studies in VinhLong, An Giang, Kien Giang, Dong Thap and Ha Tay. Thefore, it couldbe said that information and communication ... FSWand the drug injecting proportion as well. The same result was found instudies in An Giang, Kien Giang, Dong Thap. This might be due to thefact that stop using drug is very difficult. However, ... intervention, HIV prevalence did not decreased, similarlywith many studies of Nguyen Manh Cuong (2008), Hoang Duc Hanh(2010), Nguyen Khac Hien (2010), Wariki (2012). However, manystudies showed...