The impact of indoor residual spraying of deltamethrin on dengue vector populations in the Peruvian Amazon
| Autor: | Claudia Paredes-Esquivel, Mar Leza, Miguel Angel Miranda, Wilma Casanova, M. Estrugo, Enrique Chalco, Ricardo del Río, Audrey Lenhart |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Insecticides Mosquito Control Veterinary (miscellaneous) 030231 tropical medicine Indoor residual spraying Aedes aegypti Dengue virus Biology medicine.disease_cause Dengue fever Toxicology Dengue 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Aedes parasitic diseases Nitriles Peru Pyrethrins medicine Animals Humans Construction Materials Dengue Virus biology.organism_classification medicine.disease Insect Vectors Mosquito control 030104 developmental biology Infectious Diseases Deltamethrin chemistry Insect Science Vector (epidemiology) Housing Parasitology Biological Assay Public Health |
| Zdroj: | Acta tropica. 154 |
| ISSN: | 1873-6254 |
| Popis: | Dengue is an important public health problem in the Amazon area of Peru, resulting in significant morbidity each year. As in other areas of the world, ultra-low volume (ULV) application of insecticides is the main strategy to reduce adult populations of the dengue vector Aedes aegypti, despite growing evidence of its limitations as a single control method. This study investigated the efficacy of deltamethrin S.C. applied through indoor residual spraying (IRS) of dwellings in reducing A. aegypti populations. The residual effect of the insecticide was tested by monthly bioassays on the three most common indoor surfaces found in the Amazon area: painted wood, unpainted wood and brick. The results showed that in an area with moderate levels of A. aegypti infestation, IRS dramatically reduced all immature indices the first week after deltamethrin IRS application and the adult index from 18.5 to 3.1, four weeks after intervention (p0.05). Even though housing conditions facilitated reinfestation with A. aegypti (100% of the houses have open roof eaves, 31.5% lack sewage systems, and 60.4% collected rain in open containers), indices remained low compared to baseline 16 weeks after insecticide application. Bioassays showed that deltamethrin S.C. caused mortalities80% 8 weeks after application on all types of surfaces. The residual effect of the insecticide was greater on brick than on wooden walls (p0.05). Our results demonstrate that IRS can have both an immediate and sustained effect on reducing adult and immature A. aegypti populations and should be considered as an adult mosquito control strategy by dengue vector control programs. |
| Databáze: | OpenAIRE |
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