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Volume 12, Number 9—September 2006

Research

Periurban Trypanosoma cruzi–infected Triatoma infestans, Arequipa, Peru

Michael Zachary Levy*†‡Comments to Author , Natalie M. Bowman‡, Vivian Kawai‡, Lance A. Waller†, Juan Geny Cornejo del Carpio§, Eleazar Cordova Benzaquen¶, Robert H. Gilman‡#, and Caryn Bern*
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †Emory University, Atlanta, Georgia, USA; ‡Asociación Benéfica Proyectos en Informática, Salud, Medicina y Agricultura, Lima, Peru; §Dirección Regional del Ministerio de Salud, Arequipa, Peru; ¶Universidad Nacional San Agustín, Arequipa, Peru; #Johns Hopkins University, Baltimore, Maryland, USA

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Table 2

Determinants of population density of Triatoma infestans in animal enclosures in infested households of a periurban community of Arequipa, Peru*

Risk factor Mean no. triatomines captured (range) Univariate zero-truncated negative binomial regression Multivariate zero-truncated negative binomial regression
Ratio (95% CI) p value Adjusted ratio (95% CI) p value
Animal host
Guinea pigs 33.9 (1–343) 2.25 (0.9–5.8) 0.09 2.38 (1.0–5.7) 0.05
No animals present 2.6 (1–7) 0.08 (0.02–0.32) <0.01 0.15 (0.04–0.57) <0.01
Chickens† 28.2 (1–79) 1.38 (0.23–8.4) 0.70
Turkeys†‡ 6.0 (1–15) 0.18 (0.02–1.5) 0.11
No. animals†§ 1.0 (0.92–1.22) 0.65
Material
Wire mesh only 6.7 (1–10) 0.21 (0.02–1.75) 0.15 0.09 (0.01–0.6) 0.02
Unmortared basalt 11.8 (1–109) 0.38 (0.15–0.96) 0.04 0.35 (0.15–0.80) 0.01
Mortared brick, basalt, and sillar only 6.5 (3–15) 0.20 (0.03–1.3) 0.09 0.21 (0.04–1.1) 0.06
Unmortared brick† 23.3 (1–90) 1.13 (0.46–2.8) 0.80
Adobe† 21.0 (1–112) 0.94 (0.22–4.0) 0.94
Insecticide use† 29.8 (1–112) 1.1 (0.45–2.7) 0.80

*Triatomine density was estimated by timed capture of insects by trained collectors. OR, odds ratio; CI, confidence interval.
†Dropped from the multivariate model.
‡1 turkey enclosure, which contained 598 T. infestans, was considered an outlier and left out of analysis.
§No mean is given for continuous variables.

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