A survey in togliatti , a city of one million , showed that 56 percent of intravenous drug users who took part in the survey were hiv - positive ; the majority didn ' t know they had the virus 在人口100万的陶里亚帝市所做的调查显示，参与研究的静脉注射毒品使用者当中，有56 %感染了爱滋病毒；可是绝大多数不知道自身已经感染。
