## Vector of Lymphatic Filariasis in India **Key Point:** Culex quinquefasciatus is the principal vector of lymphatic filariasis (LF) in urban and semi-urban areas of India, responsible for the majority of LF cases in the country. ### Epidemiology of Filaria Vectors in India | Vector Species | Habitat | Geographic Distribution | Parasite Transmitted | |---|---|---|---| | Culex quinquefasciatus | Urban, semi-urban, polluted water | Pan-India, especially cities | Wuchereria bancrofti | | Anopheles stephensi | Rural, semi-urban | Coastal areas (Kerala, Tamil Nadu) | W. bancrofti | | Mansonia uniformis | Rural, swampy areas | Coastal and forested regions | Brugia malayi | | Aedes aegypti | Urban, peridomestic | Dengue vector, NOT filaria vector | — | **High-Yield:** Culex quinquefasciatus breeds in stagnant, polluted water (drains, sewage, ditches) and is highly anthropophilic, making it the dominant vector in densely populated urban centers like Delhi, Mumbai, and Kolkata. ### NVBDCP Strategy for Filaria Control 1. **Mass Drug Administration (MDA):** Annual or bi-annual distribution of diethylcarbamazine (DEC) + albendazole to entire endemic populations 2. **Vector Control:** Indoor residual spraying (IRS) and environmental management (source reduction) 3. **Surveillance:** Microfilaremia surveys to monitor elimination progress **Clinical Pearl:** Brugia malayi (transmitted by Mansonia) causes nocturnal periodicity in coastal/forested areas, while W. bancrofti (Culex-transmitted) shows both nocturnal and sub-periodic forms depending on geographic strain. **Mnemonic:** **CQF-UB** — Culex Quinquefasciatus in Urban/semi-urban areas; **MU-RB** — Mansonia Uniformis in Rural/Brugia areas. [cite:Park 26e Ch 8]
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