Prevalence of Aedes mosquitoes in various localities of Delhi during dengue transmission season

Entomological investigations were carried out in various localities of different Municipal Zones of Delhi, India, from July to November 2012 with a view to study the prevalence, distribution and stratification of areas for Aedes species and to identify high risk areas in the town prone to dengue/ DHF outbreak. A total of 1050 houses including some outdoor habitats were searched for Aedes breeding. Of the total houses surveyed, Aedes breeding could be detected in domestic containers/drums, water storage tanks in 276 houses. In all, a total of 8972 water containers were searched, out of which 1893 were found positive for Aedes breeding. The overall house index (HI), container index (CI), breteau index (BI), and pupal index (PI) were 26.28, 21.09, 180.28 and 67.33 respectively. Aedes aegypti was the predominant species in intra-domestic and peri-domestic containers, while Aedes albopictus and Aedes vittatus larvae were also observed in outdoor habitats. Aedes aegypti breeding was detected in all the localities, where dengue cases were recorded during the past 3 years. Based on the various indices, Aedes aegypti population was most prevalent in Sangam Vihar locality in MCD south Zone, irrespective to the number of dengue cases.

Key words: Dengue fever, Aedes breeding, house index, container index, breteau index, pupal index, Delhi

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