... 13 .4% to 3.8% (p=0.0001) CHAPTER 4: DISCUSSION 4. 1 HIV/ STI situation and related factors in FSWs in districts of Ha Noi 2005 -2006 4. 1.1 HIV/ STI prevalence in FSW in Ha Noi 2005 -2006 4. 1.1.1 HIV ... 2005-2006 3.1.1 HIV/ STI prevalence in FSW Figure 3 .4 HIV prevalence by FSW type and by drug use behavior The survey 2005-2006 showed that 16.6% FSW got HIV infected According to figure 3 .4, HIV prevalence ... proportion among FSW 4. 2 .4 Effect of HIV prevalence After our intervention, HIV prevalence did not decreased, similarly with many studies of Nguyen Manh Cuong (2008), Hoang Duc Hanh (2010), Nguyen...