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Triatomine infestation in Guatemala: spatial assessment after two rounds of vector control.

Abstract

In 2000, the Guatemalan Ministry of Health initiated a Chagas disease program to control Rhodnius prolixus and Triatoma dimidiata by periodic house spraying with pyrethroid insecticides to characterize infestation patterns and analyze the contribution of programmatic practices to these patterns. Spatial infestation patterns at three time points were identified using the Getis-Ord Gi*(d) test. Logistic regression was used to assess predictors of reinfestation after pyrethroid insecticide administration. Spatial analysis showed high and low clusters of infestation at three time points. After two rounds of spray, 178 communities persistently fell in high infestation clusters. A time lapse between rounds of vector control greater than 6 months was associated with 1.54 (95% confidence interval = 1.07-2.23) times increased odds of reinfestation after first spray, whereas a time lapse of greater than 1 year was associated with 2.66 (95% confidence interval = 1.85-3.83) times increased odds of reinfestation after first spray compared with localities where the time lapse was less than 180 days. The time lapse between rounds of vector control should remain under 1 year. Spatial analysis can guide targeted vector control efforts by enabling tracking of reinfestation hotspots and improved targeting of resources.

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  • Authors

    Manne J, Nakagawa J, Yamagata Y, Goehler A, Brownstein JS, Castro MC

    Institution

    Department of Global Health and Population, Harvard University School of Public Health, Boston, Massachusetts 02115, USA. jmanne@post.harvard.edu

    Source

    The American journal of tropical medicine and hygiene 86:3 2012 Mar pg 446-54

    MeSH

    Animals
    Chagas Disease
    Environmental Monitoring
    Guatemala
    Housing
    Insect Control
    Insect Vectors
    Insecticides
    Logistic Models
    Parasitic Diseases
    Pyrethrins
    Rhodnius
    Triatoma

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    22403315