“…For hidden or marginalised populations, complex social and structural determinants intersect to affect HIV transmission risk, access to testing and engagement with health services (Liau et al, 2013). Structural barriers include economic disadvantage, unstable employment, language barriers, unfamiliarity with health services, Medicare ineligibility, geographical isolation and incarceration (Carman, Grierson, Pitts, Hurley, & Power, 2010;Herrmann et al, 2012;Newman et al, 2007). Social barriers include fear of disclosure of sexual status, reluctance to discuss sexual practices, underestimated notions of HIV risk and a lack of social support (Blondell et al, 2015;Carman et al, 2010;Herrmann et al, 2012;Newman et al, 2007;Sprague & Simon, 2014;Thomas, Aggleton, & Anderson, 2010).…”