Table 2. Economic parameters.

Parameter	Definition	Scenario	Value	Source
	Antiviral treatment costs per treatment	all		[12], [56], [73]
	Monetarised QALY loss per treatment	A, B		See text
		C	0	-
	HCV infection costs per year	all	657	[12], [56], [73]
	Monetarised QALY loss for HCV per year	A, B	3,800	See text
		C	0	-
	Recruitment and testing cost (per year per unit )	all	40,000	Little data, see text [53], [55]
	Discounting rate for costs and health utility losses (annual)	all	3.5%	[60]
	Maximum annual budget (per 1,000 IDUs)	all	50,000–300,000	-

Scenario A: minimising health service costs and HCV health utility losses (measured in monetarised QALY loss). Scenario B: minimising health service costs and HCV health utility losses with a final time prevalence target. Scenario C: minimising only health service costs with a final time prevalence target.