“…Important factors identified in both the HIV drug and sex risk literature, and found to be variously associated with HIV risks, but not studied among hospitalized IDUs in North America, include gender [4–6], alcohol use [7–11], cocaine use [12, 13], mental health function [14–16], and homelessness [14, 17, 18]. Hospitalization can provide a unique opportunity for identifying drug users who are not seeking addiction treatment and are at risk for acquiring HIV.…”