Observed infestation by Chagas disease vectors in 414 man-made ecotopes of the lower Jaguaribe valley in northeastern Brazil: naïve infestation indices and number of vectors collected.

IInaïve, observed infestation index; Vectors, number of triatomine bugs collected in each locality; Density, mean number of vectors across all ecotopes sampled; Crowding, mean number of vectors across ecotopes in which at least one vector was detected; differences between localities were highly significant: observed infestation, Fisher's exact test, P2 = 27.25, d.f. = 1, PObserved infestation by Chagas disease vectors in 414 man-made ecotopes of the lower Jaguaribe valley in northeastern Brazil: naïve infestation indices and number of vectors collected.