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Table 3 Triatomine infestation found over three visits in four rural communities in Portoviejo county, the Manabí province, Ecuador*

From: Limitations of selective deltamethrin application for triatomine control in central coastal Ecuador

  Rhodnius ecuadoriensis Panstrongylus howardi Both triatomines
  Initial visit 6 month 12 month Initial visit 6 month 12 month Initial visit 6 month 12 month
Houses infested¥ 14 13 11 5 6 0 16 16 11
Infestation index (%) 13 12 10 5 5 0 15 15 10
Density index 1.8 ± 6.0 1.0 ± 0.3 1.5 ± 7.1 0.2 ± 2.8 0.2 ± 1.0 - 2.0 ± 6.3 1.21 ± 4.3 1.5 ± 7.1
  (0--38) (0--29) (0--58) (0--17) (0--7) - (0--38) (0--29) (0--58)
Crowding index 13.9 ± 10.9 8.5 ± 9.0 14.7 ± 18 4.8 ± 5.8 3.5 ± 2.8 - 13.7 ± 10.6 8.3 ± 31.1 14.7 ± 18
  (1--38) (1--29) (1--58) (0--15) (0--7) - (1--38) (1--29) (1--58)
Colonization index (%) 93 62 91 100 50 0 94 63 91
  1. * Includes only 109 domestic units that were examined in each of the 3 visits. In each visit with permission of the head of the household manual triatomine searches were conducted in the house and in the peridomicile using the one man/hour method.
  2. ¥ Infestation is defined as finding at least one live triatomine. If found infested at any visit houses and peridomiciliary areas were sprayed with deltamethrin at 25 mg a.i./m2. Entomological indices: Infestation index (100 × number of DUs infested/number of DUs searched), density (number of triatomines captured/number of DUs searched) ± standard desviation (SD) and range, crowding (number of triatomines captured/number of DUs infested) ± SD and range, and colonization index (100 × number of DUs with nymphs/number of DUs infested).