Entomological Investigation of Dengue Outbreak in Raigarh, Central India: Dominance of Aedes albopictus as the Primary Vector
Year: 2025
Type: article
Abstract: BACKGROUND OBJECTIVES: Dengue outbreaks pose a significant public health threat in Raigarh city, central India. During the 2023-2024 rainy season, there was a marked rise in febrile cases resembling dengue across urban areas. In response, ICMR-National Institute of Malaria Research, in collaboration with local health authorities, initiated an entomological surveillance campaign. This effort aimed to identify dengue vectors and implement rapid intervention strategies to mitigate disease transmission. METHODS: An entomological survey was conducted in 16 wards of Raigarh city. The study incorporated epidemiological data spanning nine years (2016-2024), along with a detailed month-wise analysis of dengue cases reported in 2023 and 2024. Vector density was assessed with House Index (HI), Container Index (CI), and Breteau Index (BI), to identify high-risk areas and predominant vector species. RESULTS: A total of 2080 water-holding containers were identified across 622 surveyed properties, for vector breeding. Among these, 67 (35%) were routinely used as household containers, while 124 (65%) were disposable items. Larval collections yielded 986 Aedes specimens, including 104 pupae, with Aedes albopictus accounting for 85% of the total, followed by Aedes aegypti (8%) and Aedes vittatus (5%). The entomological indices reflected a critical vector proliferation scenario, with HI of 17.35%, CI of 7%, and BI of 24.49. INTERPRETATION CONCLUSION: Targeted entomological surveillance, community awareness programs with interventions have contributed to a notable reduction in dengue case incidence. The findings establish Aedes albopictus as the predominant dengue vector in the region, alongside Aedes aegypti.
Source: Journal of Vector Borne Diseases
Authors: D P Sinha, S P Singh, T G Kulwedi, Jitendra Kumar, P K Bharti
Institution: National Institute of Malaria Research
Language: English
Field: Medicine
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4414465504
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