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      Determinação do potencial larvófago de Poecilia reticulata em condições domésticas de controle biológico Translated title: Larvovirous potencial of Poecilia reticulata at domestic biological control conditions

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          Abstract

          Configurada como um dos mais importantes problemas de saúde pública do mundo, a dengue atinge especialmente países com clima tropical, como o Brasil. O controle biológico por meio da utilização de peixes larvófagos aparece como alternativa para reduzir os índices de infestação do vetor da dengue. O presente trabalho objetiva avaliar e descrever condições em que peixes da espécie Poecilia reticulata possam ser utilizados como controladores biológicos de larvas de Aedes aegypti em ambiente doméstico. Para tanto, o potencial larvófago diário (observação direta) de diferentes grupos de P. reticulata foi calculado considerando-se a influência do sexo e do tamanho dos espécimes empregados. Os resultados dos ensaios revelaram que o potencial larvófago de P. reticulata varia com o sexo. Observou-se também que a capacidade controladora do grupo composto apenas por fêmeas foi cerca de duas vezes maior quando comparada à dos machos da espécie.

          Translated abstract

          Configured as an important public health problem in the world, the dengue fever affects tropical countries, like Brazil. Biological control through the use of larvivorous fish appears as an alternative to reduce the infestation rates of the dengue vector. This work aims to evaluate and describe conditions under which Poecilia reticulata fishes can be used as biological controllers of Aedes aegypti in a domestic environment. Thus, the daily larvivorous potential (direct observation) of different groups of P. reticulata was calculated, considering the influence of sex and size of the used specimens. The test results revealed that P. reticulatalarvivorous potential ranges with sex, and found that the ability of the group composed only of females was about twice as high compared to that of males of the species.

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          Most cited references 18

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          Dengue and dengue hemorrhagic fever.

          Dengue fever, a very old disease, has reemerged in the past 20 years with an expanded geographic distribution of both the viruses and the mosquito vectors, increased epidemic activity, the development of hyperendemicity (the cocirculation of multiple serotypes), and the emergence of dengue hemorrhagic fever in new geographic regions. In 1998 this mosquito-borne disease is the most important tropical infectious disease after malaria, with an estimated 100 million cases of dengue fever, 500,000 cases of dengue hemorrhagic fever, and 25,000 deaths annually. The reasons for this resurgence and emergence of dengue hemorrhagic fever in the waning years of the 20th century are complex and not fully understood, but demographic, societal, and public health infrastructure changes in the past 30 years have contributed greatly. This paper reviews the changing epidemiology of dengue and dengue hemorrhagic fever by geographic region, the natural history and transmission cycles, clinical diagnosis of both dengue fever and dengue hemorrhagic fever, serologic and virologic laboratory diagnoses, pathogenesis, surveillance, prevention, and control. A major challenge for public health officials in all tropical areas of the world is to develop and implement sustainable prevention and control programs that will reverse the trend of emergent dengue hemorrhagic fever.
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            Pupal survey: an epidemiologically significant surveillance method for Aedes aegypti: an example using data from Trinidad.

            This report documents the results of a country-wide pupal survey of Aedes aegypti (L.) conducted in Trinidad. The survey was designed to identify the important Ae. aegypti-producing containers, importance being a function of a container's abundance and its productivity. Results are summarized on a country-wide basis and by county: urban versus rural comparisons are also made. Numerically, the most common water-filled containers positive for the larvae or pupae of Ae. aegypti (foci) were outdoor drums, water storage tanks and buckets, laundry tubs, discarded tires, and small miscellaneous containers such as drink bottles and cans. The island-wide average number of foci per hectare was 287 and ranged between 65 and 499. The average standing crop per container of Ae. aegypti pupae was 9.5 and ranged 12-fold, the most and least productive being the flower pot (> 30) and the small indoor vase ( 90% of all Ae. aegypti pupae: the remaining seven types were responsible for 80% of Ae. aegypti production in the country. In our survey, the traditional Stegomyia indices used to document the density of Ae. aegypti and predict the threat of dengue transmission, the House, Container, and Breteau indices, were seen to have virtually no correspondence with the actual number of pupae per hectare or per person. We conclude that pupal survey is more appropriate for assessing risk and directing control operations.
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              Resistance of Aedes aegypti to organophosphates in several municipalities in the State of Rio de Janeiro and Espírito Santo, Brazil.

              Chemical insecticides have been widely used in Brazil for several years. This exposes mosquito populations to an intense selection pressure for resistance to insecticides. In 1999, the Brazilian National Health Foundation started the first program designed to monitor the resistance of Aedes aegypti to insecticides. We analyzed populations from 10 municipalities (from 84 selected in Brazil) in the states of Rio de Janeiro and Espírito Santo. Exposure of larvae to a diagnostic dose of temephos showed in alterations in susceptibility in all populations. Mosquitoes from eight municipalities exhibited resistance, with mortality levels ranging from 74% (Campos dos Goytacazes, Rio de Janeiro) to 23.5% (São Gonçalo, Rio de Janeiro). The resistance ratios of mosquitoes from three municipalities ranged from 3.59 to 12.41. Adults from only one municipality (Nova Iguaçu, Rio de Janeiro) remained susceptible to both fenitrothion and malathion. These results are being used to define new local vector control strategies.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                cadsc
                Cadernos Saúde Coletiva
                Cad. saúde colet.
                Instituto de Estudos em Saúde Coletiva da Universidade Federal do Rio de Janeiro (Rio de Janeiro )
                2358-291X
                September 2014
                : 22
                : 3
                : 241-245
                Affiliations
                [1 ] Universidade Federal de Uberlândia Brazil
                [2 ] Fundação Carmelitana Mário Palmério Brazil
                Article
                S1414-462X2014000300241
                10.1590/1414-462X201400030004

                http://creativecommons.org/licenses/by/4.0/

                Product
                Product Information: SciELO Brazil
                Categories
                PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH

                Public health

                aedes aegypti, saúde pública, dengue, public health

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