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Climate change, environmental temperature change, and resistance to insecticides of dengue mosquito

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Revista Panamericana de Salud Pública

Organización Panamericana de la Salud

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      An observation on correlation between rainfall and the prevalence of clinical cases of dengue in Thailand.

      An investigation was carried out in Thailand to study the correlation between rainfall and prevalence of dengue infection during 2002-03, which can be used for prevention and control of the disease. Rainfall data (2002-03) collected from Ministry of Public Health were utilised for transformation of the infection and the rainfall data were derived from Royal Irrigation Department, Thailand. The correlation between the rainfall and the prevalence of dengue was assessed by regression analysis. The least square equation plot prevalence (y) versus rainfall (x) is y = 3.0x + 4.6 (r = 0.78, p < 0.05) (r = 0.68, p < 0.05). The study indicated that the prevalence of dengue infection in Thailand may depend on rainfall. Therefore, the surveillance and control of mosquito should be intensified during the period with high rainfall is recommended. However, the other confounding factors like ambient temperature and humidity which also determine the transmission of dengue should be looked into, before concluding that the increased prevalence is a result of rainfall alone. Further, similar studies to assess the correlation between the rainfall and prevalence of infection in the other countries are required to confirm these observations.
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        Impact of environmental temperatures on resistance to organophosphate insecticides in Aedes aegypti from Trinidad

        OBJECTIVE: To examine the effects of increasing larval rearing temperatures on the resistance status of Trinidadian populations of Aedes aegypti to organophosphate (OP) insecticides. METHODS: In 2007-2008, bioassays and biochemical assays were conducted on A. aegypti larvae collected in 2006 from eight geographically distinct areas in Trinidad (Trinidad and Tobago). Larval populations were reared at four temperatures (28 ± 2ºC, 32ºC, 34ºC, and 36ºC) prior to bioassays with OP insecticides (fenthion, malathion, and temephos) and biochemical assays for esterase enzymes. RESULTS: Most larval populations reared at 28 ± 2ºC were susceptible to fenthion (>98% mortality) but resistant to malathion and temephos (< 80% mortality). A positive association was found between resistance to OP insecticides and increased activities of α- and β-esterases in larval populations reared at 28 ± 2ºC. Although larval populations reared at higher temperatures showed variations in resistance to OPs, there was a general increase in susceptibility. However, increases or decreases in activity levels of enzymes did not always correspond with an increase or decrease in the proportion of resistant individuals reared at higher temperatures. CONCLUSIONS: Although global warming may cause an increase in dengue transmission, based on the current results, the use of insecticides for dengue prevention and control may yet be effective if temperatures increase as projected.
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          Focus on climate change and health

           V Wiwanitkit (2010)
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            Author and article information

            Affiliations
            [1 ] Wiwanitkit House Thailand
            Contributors
            Role: ND
            Journal
            rpsp
            Revista Panamericana de Salud Pública
            Rev Panam Salud Publica
            Organización Panamericana de la Salud (Washington )
            1020-4989
            November 2013
            : 34
            : 5
            : 366
            S1020-49892013001100012

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

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            Product Information: SciELO Public Health
            Categories
            Health Policy & Services

            Public health

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