“…The prevalence of HIV/AIDS is three to nine times higher among persons who are homeless or unstably housed compared with persons with stable and adequate housing, depending upon the population and geographic area studied (Allen et al, 1994;Culhane et al, 2001;Estebanez et al, 2000;Fournier et al, 1996;Paris et al, 1996;Shlay et al, 1996;Torres et al, 1990;Zolopa et al, 1994). For example, disproportionately high rates of HIV risk behaviors and infection are found especially among homeless youth (Bailey et al, 1998;Clatts et al, 1998;Clements et al, 1997;Kral et al, 1997;Moon et al, 2001;Pfeifer and Oliver, 1997;Walters, 1999) and homeless persons who abuse drugs or are mentally ill (Andia et al, 2001;Kilbourne et al, 2002;Klinkenberg et al, 2003;Latkin, 1998;Nyamathi et al, 1997;Smereck and Hockman, 1998;Sohler et al, 2000;Somlai et al, 1998;Susser et al, 1993;Zanis et al, 1997). Other studies have shown that among persons at the highest risk for HIV due to injecting drug use or high risk sex, those without a stable home are significantly more likely than others to become infected over time (Joseph and Roman-Nay, 1990;Popkin et al, 1993;Smereck and Hockman, 1998;Song et al, 2000;Susser et al, 1996).…”