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Epidemiological and entomological surveillance of dengue: Finding and lessons learnt during the seasonal spurt in a large urban area in Delhi NCR

1 Department of Community Medicine, Army College of Medical Sciences, Delhi 110010, India
2 NHSRC, New Delhi, India
3 Department of Community Medicine, AFMC, Pune 411040, India

Correspondence Address:
Arun K Yadav,
Department of Community Medicine, AFMC, Pune
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-9062.318316

Background & objectives: Dengue is endemic in the National Capital Region of Delhi, India. As per National Vector Borne Disease Control Programme (NVBDCP) reports, the reported confirmed dengue cases in the city increased by 165% between 2012- 2013. This study was undertaken to assess the entomological indices in urban area that precede active disease transmission and detect the seasonal shift in container breeding preference of the Aedes species for targeted intervention in future. Methods: The study was undertaken in defined geographical area over a period of one year. The cases of dengue admitted to a hospital were reported along with various entomological indices. Prospective analysis of entomological indices collected throughout 2013 along with seasonal container preference for breeding of Aedes species was carried out. Results: A positive correlation was found between the entomological indices (House Index-HI, Container Index-CI and Breteau Index-BI) and the surge in dengue cases. The analysis revealed that active transmission took place in the Delhi Cantonment area with a HI, CI and BI >1.25, >7.5 and >3.15 respectively. Aedes species showed a phenomenon of annual pulsation, breeding in primary foci perennially and shifting out to secondary breeding sites with the onset of monsoon. Interpretation & conclusion: Targeting the primary breeding sites of Aedes throughout the year along with source reduction of secondary breeding sites would result in a significant decline in the entomological indices and dengue cases in the future. Special focused intervention needs to be directed at hospitals, educational institutions and construction sites considering their high receptivity towards Aedes breeding.

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