Table 2.

The number of households infested by Triatoma infestans and Triatoma infestans carrying Trypanosoma cruzi over three development stages along a transect of Arequipa Peru, 2010–2011.

development stage	no. houses surveyed	no. houses w/vectors (%)	no. houses w/vectors carrying parasites (%)
invasion	19	0a,b (0.0)	0 (0.0)
pueblo joven	258	85 (32.9)	10 (11.8)
established communities	147	36 (24.5)	17c (47.2)
total	424	121	27

^aNumbers represent presence of vectors or vectors carrying parasites during any of the four sampling periods.

^bThe proportion of houses infested with vectors in invasions is significantly lower than that in other communities (p-value < 0.003; Fisher's exact test).

^cThe proportion of houses harbouring vectors carrying parasites in established communities was significantly higher than that in pueblos jovenes (p-value = 0.0017; Fisher's exact test).