The Pampa del Indio project: sustainable vector control and long-term declines in the prevalence and abundance of Triatoma infestans infected with Trypanosoma cruzi in the Argentine Chaco

Table 1 Distribution of Triatoma infestans collected by any method (including third instars and later stages) and infected with Trypanosoma cruzi according to operational area, main ecotopes, household ethnicity, triatomine stage, baseline domestic infestation (by timed manual searches) and intervention period in Pampa del Indio, 2007–2016

Factor	Level	No. of bugs collected	No. of bugs examined	Percentage of infected bugs^a
Factor	Level	No. of bugs collected	No. of bugs examined	Mean	95% CI
Area	1	5795	4050	19.5	18.3–20.8
	2	2016	611	14.9	12.3–17.9
	3	2945	1058	26.0	23.4–28.7
	4	2217	678	12.5	10.2–15.3
Ecotope	Domiciles	6252	3164	27.2	25.7–28.8
	Kitchen-storerooms	3845	2090	16.6	15.1–18.3
	Chicken coops	2682	1094	1.8	1.2–2.8
	Missing data	194	49	24.5
Household ethnicity	Qom	5689	2206	26.9	25.1–28.8
	Creoles	7234	4168	15.3	14.2–16.4
	Missing data	50	23	39.1
Stage	3	2645	640	5.9	4.3–8.1
	4	2058	1050	9.9	8.2–11.9
	5	3416	2038	20.6	18.9–22.4
	Adult females	2184	1156	27.6	25.1–30.2
	Adult males	2664	1513	23.8	21.7–26.0
	Missing data	6	0
Baseline domestic infestation	Yes	7308	3905	26.8	25.5–28.2
	No	5063	2376	7.2	6.2–8.3
	Not applicable	602	116	19.8
Intervention period	Baseline	8131	4115	24.1	22.8–25.4
	Early	2720	1584	10.1	8.7–11.7
	Late	2122	698	13.0	10.6–15.8
Total		12973	6397	19.4	18.4–20.4

CI Confidence interval, Creole person of European [mainly Spanish] or mixed origin), Qom indigenous people
^aInfection with Trypanosoma cruzi determined by optical microscopy (OM) or kinetoplast DNA (kDNA)-PCR

ISSN: 1756-3305