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Empirical optimization of risk thresholds for dengue: an approach towards entomological management of Aedes mosquitoes based on larval indices in the Kandy District of Sri Lanka

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dc.contributor.author Udayanga, L. en
dc.contributor.author Gunathilaka, N. en
dc.contributor.author Iqbal, M.C.M. en
dc.contributor.author Najim, M.M.M. en_US
dc.contributor.author Pahalagedara, K. en
dc.contributor.author Abeyewickreme, W. en
dc.date.accessioned 2018-08-08T10:12:22Z en
dc.date.available 2018-08-08T10:12:22Z en_US
dc.date.issued 2018 en_US
dc.identifier.citation Parasites & Vectors.2018;11(1):368 en_US
dc.identifier.issn 1756-3305 (Electronic) en_US
dc.identifier.issn 1756-3305 (Linking) en
dc.identifier.uri http://repository.kln.ac.lk/handle/123456789/18965 en_US
dc.description Indexed In MEDLINE en_US
dc.description.abstract BACKGROUND: Larval indices such as Premise Index (PI), Breteau Index (BI) and Container Index (CI) are widely used to interpret the density of dengue vectors in surveillance programmes. These indices may be useful for forecasting disease outbreaks in an area. However, use of the values of these indices as alarm signals is rarely considered in control programmes. Therefore, the current study aims to propose threshold values for vector indices based on an empirical modeling approach for the Kandy District of Sri Lanka. METHODS: Monthly vector indices, viz PI, BI and CI, for Aedes aegypti and Aedes albopictus, of four selected dengue high risk Medical Officer of Health (MOH) areas in the Kandy District from January 2010 to August 2017, were used in the study. Gumbel frequency analysis was used to calculate the exceedance probability of quantitative values for each individual larval index within the relevant MOH area, individually and to set up the threshold values for the entomological management of dengue vectors. RESULTS: Among the study MOH areas, Akurana indicated a relatively high density of both Ae. aegypti and Ae. albopictus, while Gangawata Korale MOH area had the lowest. Based on Ae. aegypti, threshold values were defined for Kandy as low risk (BIagp > 1.77), risk (BIagp > 3.23), moderate risk (BIagp > 4.47) and high risk (BIagp > 6.23). In addition, PI > 6.75 was defined as low risk, while PI > 9.43 and PI>12.82 were defined as moderate and high risk, respectively as an average. CONCLUSIONS: Threshold values recommended for Ae. aegypti (primary vector for dengue) along with cut-off values for PI (for Ae. aegypti and Ae. albopictus), could be suggested as indicators for decision making in vector control efforts. This may also facilitate the rational use of financial allocations, technical and human resources for vector control approaches in Sri Lanka in a fruitful manner. en_US
dc.language.iso en_US en_US
dc.publisher BioMed Central en_US
dc.subject Dengue en_US
dc.title Empirical optimization of risk thresholds for dengue: an approach towards entomological management of Aedes mosquitoes based on larval indices in the Kandy District of Sri Lanka en_US
dc.type Article en_US


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