Table 1. Targeted areas within districts and localities and distribution of reports, inspections, and uncovered infestation during surveillance phase of a Chagas disease vector control program, Arequipa, Peru, 2003–2011*.

Nested units	City blocks	Households	Households reporting infestations	Households inspected	Households inspected and found infested
Participating districts, n = 8	5,955	79,972	301	785	145
Infested localities, n = 256	4,755	67,218	258	714	133
Targeted areas	3,727	56,491	225†	613	116‡

*Reporting and inspected households during surveillance are counted from January 2009 through end of December 2012. 
†Households in targeted city blocks have a similar rate of report and risk of being positive during the surveillance phase as other households in their districts: odds ratio 1.12, p = 0.45; and 0.94, p = 0.77, controlling for diversity between districts.
‡Among these households, 77 were reporting households (35% of the 219 inspected reporting households).