“…58 Despite the scale of the issue and the targets set, many gaps remain in our knowledge of homelessness in Australia. Notably in this context, information on the prevalence of drug use among homeless people is substantial and clearly demonstrates a strong relationship, 10,12,14,15,17,59 yet data on homelessness among problem drug users are less readily available, having been collected only among restricted samples of drug users, such as those seeking treatment, 20 or participants of studies of HIV prevalence, incidence, and risk behaviors and risk reduction interventions. 34,48,[51][52][53] Since 1995, the Australian NSP Survey (ANSPS) has provided annual point prevalence estimates to monitor patterns of BBV infection and risk behaviors among needle and syringe program (NSP) clients.…”