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      Variaciones de tres índices larvarios de Aedes aegypti (L.) (Diptera: Culicidae) y su relación con los casos de dengue en Yurimaguas, Perú, 2000 - 2002 Translated title: VARIATIONS OF THREE Aedes aegypti (L.) LARVAL INDEXES (DIPTERA: CULICIDAE) AND ITS RELATIONSHIP WITH DENGUE CASES IN YURIMAGUAS, PERU, 2000-2002

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      Parasitología latinoamericana
      Sociedad Chilena de Parasitología
      Aedes, Dengue, Entomological indexes, Peru

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          Abstract

          Se realizó un estudio sobre el comportamiento poblacional de Aedes aegypti en su fase larvaria, para explicar sus fluctuaciones a través de tres indicadores entomológicos (IE) y su relación con los casos de dengue en la ciudad de Yurimaguas, Loreto, Perú. Se censaron las viviendas positivas a través de tres IE: {Índice de Infestación domiciliaria o también llamado Índice aédico (IA), Índice de recipientes (IR) e Índice de Breteau (IB)} y los tipos de recipientes más comunes en 11 zonas de la ciudad de Yurimaguas durante el 2000 al 2002. Se encontró que los tres IE presentaron diferencias entre las doce evalua-ciones realizadas durante el 2000 al 2002. En los tres IE se ha notado una tendencia a la disminución de Abril-2000 a Diciembre-2002. El IA disminuye en un 46,82%; el IR en un 67,29% y IB disminuye en 43,71%. Los casos de dengue registrados del 2000 al 2002 disminuyeron en 80,6%. No se observaron diferencias entre las 11 zonas de la ciudad para IA, IR e IB. Los IA, IB e IR estuvieron altamente correlacionados lineal y positivamente durante el periodo 2000 al 2002. Sólo el IA y los casos de dengue, se encuentran correlacionados linealmente. En algunas evaluaciones del 2000 al 2002 existieron diferencias significativas para el IR e IB entre las diez categorías de recipientes. Se notaron valores altos para las cuatro categorías siguientes: 10 (inservibles), 9 (florero y macetero), 6 (llantas), tres (barril, cilindro, sansón). Se evaluaron las variaciones de los IE durante los periodos secos y lluviosos

          Translated abstract

          A research about population behaviour of Aedes aegypti (L.) in its larval phase, to explain their fluctuations through three entomological indexes and their relationships with dengue cases in Yurimaguas city, Loreto, Peru was performed. Positive housing were surveyed through three Entomological Indexes (EI) {Index of Domiciliary Infestation or Housing Index or also named Aedic Index (AI), Container Index (CI) or Breteu Index (BI)} and the kind of container more common in 11 zones of Yurimaguas city (5°53'30'' L.S; 76°05'26'' L.O), Loreto, Peru during 2000 to 2002. The three entomological indexes showed differences between all twelve evaluations performed during 2000 to 2002. In the three EI had observed a tendency to decrease from April-2000 to December-2002. AI decreased in 46.82 %; CI in 67.29 % and IB decreases in 43.71 %. The cases of dengue registered among 2000 to 2002 decreased 80.6 %. None differences between 11 zones in Yurimaguas for AI, CI and BI were observed. The three EI: AI, BI and CI all had highly lineal correlation and positive during all period 2000 to 2002. Only in AI and dengue cases, were found lineal correlation. In some evaluations among 2000 to 2002 existed significantly differences between ten categories of containers in CI and BI. Higher values for the next four categories: 10 (useless), 9 (flower pot and flower pot stand), 6 (rubber tyre), three (barrel, cylinder, sanson) were observed. The variations of EI during wet and dry periods were evaluated

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          Most cited references46

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          Critical examination of Aedes aegypti indices: correlations with abundance.

          The following immature stage indices for Aedes (Stegomyia) aegypti surveillance were evaluated in four north Queensland, Australia towns with respect to their relationship to immature and adult female densities: Breteau, House, Container, Larval Density, Stegomyia (and modifications thereof), and a newly created Adult Productivity Index. Spearman's correlations of indices that considered larval or immature (larvae and pupae) numbers had a better relationship with immature abundance but this was not necessarily the case against adult abundance. To examine the robustness of the indices, data from 758 premises in Townsville, Charters Towers, Ravenswood, and Mingela were pooled and 30 random subsamples, each consisting of 50 premises were taken. After each subsample was taken, the premises selected were reintroduced into the original data bank of 758 premises, and therefore, were available for further selection, i.e., sampling with replacement. Indices were calculated for each of the 30 subsamples and the coefficients of variation of each index were estimated from these. The Breteau, Adult Productivity, House, and Adult density indices proved to have the smallest coefficients compared with index size. No alternate index was regarded as being superior to the Breteau, including the Adult Productivity Index measuring both container type frequency and immature density. For this reason and in view of the labor intensiveness of estimating immature indices that incorporate productivity, it is recommended that new and cost-effective methods of adult surveillance be pursued.
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            Results of a community-based Aedes aegypti control program in Merida, Yucatan, Mexico.

            This report describes the results of a community-based Aedes aegypti control program in Merida, Yucatan, Mexico. Baseline surveys concerning knowledge, beliefs, and practices of 577 women and a larval survey of 616 house lots were carried out in October 1989. Following development of a public health communication intervention from this data, the program was implemented in six communities. Evaluation used an untreated control group design with pretest and two post-tests, one at completion and one six months later. Significant changes in knowledge and behavior were seen in the treatment group in both post-tests. Women in the intervention group were able to identify the Ae. aegypti mosquito, the larval production sites of the mosquito, and appropriate control methods. A behavior change proxy was measured by examining changes in the Breteau (number of positive containers/100 houses surveyed) and container indices. The Breteau index remained the same in the intervention group while it increased significantly in the comparison group. Changes were also seen with respect to individual containers. This project demonstrated that a community-based communication program aimed at larval production site elimination or control can be effective in changing behavior and reducing larval production sites.
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              Larval occurrence, oviposition behavior and biting activity of potential mosquito vectors of dengue on Samui Island, Thailand.

              A 1995 outbreak of dengue haemorrhagic fever (DHF) occurred on Samui Island in Thailand with an incidence of almost 500 cases/100,000 population. To find and develop effective strategies to control this disease through cost-effective vector control programs, entomological studies were carried out on the island between 1996 and 1998. There were two species of DHF vectors, Aedes aegypti and Ae. albopictus prevailing on the island, and the population of Ae. aegypti remained relatively constant throughout the year while the abundance of Ae. albopictus increased substantially during the rainy season (May-December) and then declined drastically in the dry season (January-April). The ranges of the three Aedes larval indices, Breteau index (BI), house index (HI) and container index (CI) were 93-310, 43-89 and 16-50 respectively. The ceramic or earthen jars both inside and outside the dwellings and concrete water storage tanks (mostly in toilets and bathrooms) served as the main breeding places of Ae. aegypti whereas coconut husks and coconut floral spathes found outdoors were the major breeding sites of Ae. albopictus. The number of washing water jars, concrete tanks and natural sites infested with Aedes larvae increased significantly in rainy season, with 60% of ovitraps become positive for Ae. albopictus eggs with an average number of 26 eggs/trap in 3 days of setting. There was a complete lack of oviposition by Ae. aegypti in outdoor ovitraps (15 m away from the houses). The indoor biting rate ranged from 1.5 to 8.1 mosquitoes/man-hour, while the outdoor rate was between 5 and 78 mosquitoes/man-hour. Of the indoor biting mosquitoes, 75.4% were identified as Ae. aegypti and 99% of the outdoor ones were Ae. albopictus. The diel biting activity of Aedes during the period from 0800 h to 1700 h in the houses was higher in the morning than in the afternoon period, with a low prevalence between 1300 h and 1400 h.
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                Author and article information

                Journal
                parasitol
                Parasitología latinoamericana
                Parasitol. latinoam.
                Sociedad Chilena de Parasitología (Santiago, , Chile )
                0717-7712
                June 2005
                : 60
                : 1-2
                : 3-16
                Affiliations
                [01] Lima orgnameUniversidad Nacional Federico Villarreal orgdiv1Facultad de Ciencias Naturales y matemáticas orgdiv2Laboratorio de Ecofisiología Animal Perú
                Article
                S0717-77122005000100001 S0717-7712(05)06000101
                10.4067/S0717-77122005000100001
                d7dab30c-cd23-41a1-967a-634931447092

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 46, Pages: 14
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                SciELO Chile

                Categories
                ARTICULOS ORIGINALES

                Entomological indexes,Dengue,Aedes,Peru
                Entomological indexes, Dengue, Aedes, Peru

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