“…Recent Canadian studies reported consistently high rates of HIV (∼10%-45%) and/or HCV infection (∼40%-85%) among crack users (DeBeck et al, 2009;Fischer et al, 2006Fischer et al, , 2010Leonard et al, 2008;Shannon, Rusch, Morgan, et al, 2008;Ti et al, 2012), and have identified crack use as a predictor for both HIV and HCV among street drug users (DeBeck et al, 2009;Fischer et al, 2006;Roy et al, 2001;Shannon, Rusch, Morgan, et al, 2008;Strathdee & Stockman, 2010). In Brazil, recent studies indicating comparably low (e.g., <10%) HIV and HCV prevalence levels, entailing a reduced BBV burden (Carvalho & Seibel, 2009;Cruz et al, 2013;de Azevedo et al, 2007;Nunes, Andrade, Galvão-Castro, Bastos, & Reingold, 2007). While sex work involvement is common across the Americas, crack users' residual BBV incidence in Brazil is largely attributed to sexual risk behaviors (e.g., sex work and sexfor-drug exchanges), with higher rates among females (Carvalho & Seibel, 2009;Nappo, Sanchez, & De Oliveira, 2011;Nunes et al, 2007).…”