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Spatial locations of Triatoma infestans (left) and Triatoma infestans carrying Trypanosoma cruzi along a transect of the city of Arequipa, Peru, over four samplings between 2010 and 2011. Points representing vector colonies (in grey) are scaled by the log of the number of vectors collected at each site; T. cruzi-infected vector colonies are shown in red on the same scale. (Online version in colour.)
