Dots represent houses. T1 represents the time period of the ‘attack phase’ of the control campaign, which occurred between January 11th, 1997 and January 6th, 2014, depending on the district. In T1, grey dots represent houses that participated in the ‘attack phase’ of the control campaign but were not found to be infested with Triatoma infestans, and black dots represent houses that participated and were found to be infested with T. infestans. Time periods T2-T4 represent the time period of the surveillance phase (T2: January 7th, 2014—January 6th, 2016; T3: January 7th, 2016—January 4th, 2018; T4: the current calendar year, currently set to (at the time of this publication) January 5th, 2018—present). In T2-4, grey dots represent houses that were inspected and not found to be infested with T. infestans during the surveillance phase.