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Larval Indices of Vector Mosquitoes as Predictors of Dengue Epidemics: An Approach to Manage Dengue Outbreaks Based on Entomological Parameters in the Districts of Colombo and Kandy, Sri Lanka
Joint Authors
Gunathilaka, Nayana
Abeyewickreme, Wimaladharma
Iqbal, M. C. M.
Udayanga, Lahiru
Aryaprema, Subashinie
Fernando, Thilan
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-06-17
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
Background.
Early detection of dengue epidemics is a vital aspect in control programmes.
Predictions based on larval indices of disease vectors are widely used in dengue control, with defined threshold values.
However, there is no set threshold in Sri Lanka at the national or regional levels for Aedes larval indices.
Therefore, the current study aimed at developing threshold values for vector indices in two dengue high-risk districts in Sri Lanka.
Methods.
Monthly vector indices (House Index [HI], Container Index [CI], Breteau Index for Aedes aegypti [BIagp], and Ae.
albopictus [BIalb]), of ten selected dengue high-risk Medical Officer of Health (MOH) areas located in Colombo and Kandy districts, were collected from January 2010 to June 2019, along with monthly reported dengue cases.
Receiver Operating Characteristic (ROC) curve analysis in SPSS (version 23) was used to assess the discriminative power of the larval indices in identifying dengue epidemics and to develop thresholds for the dengue epidemic management.
Results.
Only HI and BIagp denoted significant associations with dengue epidemics at lag periods of one and two months.
Based on Ae.
aegypti, average threshold values were defined for Colombo as Low Risk (2.4≤BIagp<3.8), Moderate Risk (3.8≤BIagp<5), High Risk (BIagp≥5), along with BIagp 2.9≤BIagp<4.2 (Low Risk), 4.2≤BIagp<5.3 (Moderate Risk), and BIagp≥5.3 (High Risk) for Kandy.
Further, 5.5≤HI<8.9, 8.9≤HI<11.9, and HI≥11.9 were defined as Low Risk, Moderate Risk, and High Risk average thresholds for HI in Colombo, while 6.9≤HI<9.1 (Low Risk), 8.9≥HI<11.8 (Moderate Risk), and HI≥11.8 (High Risk) were defined for Kandy.
Conclusions.
The defined threshold values for Ae.
aegypti and HI could be recommended as indicators for early detection of dengue epidemics and to drive vector management activities, with the objective of managing dengue epidemics with optimal usage of financial, technical, and human resources in Sri Lanka.
American Psychological Association (APA)
Udayanga, Lahiru& Aryaprema, Subashinie& Gunathilaka, Nayana& Iqbal, M. C. M.& Fernando, Thilan& Abeyewickreme, Wimaladharma. 2020. Larval Indices of Vector Mosquitoes as Predictors of Dengue Epidemics: An Approach to Manage Dengue Outbreaks Based on Entomological Parameters in the Districts of Colombo and Kandy, Sri Lanka. BioMed Research International،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1135805
Modern Language Association (MLA)
Udayanga, Lahiru…[et al.]. Larval Indices of Vector Mosquitoes as Predictors of Dengue Epidemics: An Approach to Manage Dengue Outbreaks Based on Entomological Parameters in the Districts of Colombo and Kandy, Sri Lanka. BioMed Research International No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1135805
American Medical Association (AMA)
Udayanga, Lahiru& Aryaprema, Subashinie& Gunathilaka, Nayana& Iqbal, M. C. M.& Fernando, Thilan& Abeyewickreme, Wimaladharma. Larval Indices of Vector Mosquitoes as Predictors of Dengue Epidemics: An Approach to Manage Dengue Outbreaks Based on Entomological Parameters in the Districts of Colombo and Kandy, Sri Lanka. BioMed Research International. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1135805
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1135805