“…But, the contribution of gay communities is largely assumed, untheorized, and under-researched. This report concerns itself with one aspect-injecting drug use (IDU) by gay men-of the ways in which a gay community plays out its influence and develops its practices in response of the threats of HIV/AIDS and, more recently in Australia (and elsewhere), of the growing epidemic of hepatitis C. The paper derives from an ongoing investigation that underpins a series of studies over the last eighteen years involving the lead author and many colleagues, which have addressed, in part or as well, the ways gay community as a social construct is involved, implicated, configured, deployed, and understood in these epidemics (e.g., Dowsett 1996bDowsett , 2003Dowsett, Bollen, McInnes, Couch, & Edwards, 2001;Kippax, Connell, Dowsett, & Crawford, 1993). These studies have all been social science efforts, mostly used qualitative methodologies, and all had a primary focus: understanding HIV prevention and sexual behavior change.…”