## Vectors of Lymphatic Filariasis in India **Key Point:** Lymphatic filariasis (LF) in India is transmitted by THREE vector species: Culex quinquefasciatus (urban/periurban), Anopheles species (rural), and Mansonia species (rural/forested areas). ### Vector Distribution by Region | Vector | Geographic Distribution | Transmission Pattern | Prevalence in India | |--------|------------------------|----------------------|---------------------| | **Culex quinquefasciatus** | Urban, periurban areas | Nocturnal, anthropophilic | High in cities (Delhi, Mumbai, Chennai) | | **Anopheles species** | Rural, forested areas | Nocturnal, zoophilic tendency | High in Odisha, Assam, Jharkhand | | **Mansonia species** | Rural, wetland areas | Nocturnal, zoophilic | Moderate in coastal and forested regions | **High-Yield:** India has **three-vector endemic zones** for LF, unlike Africa (Anopheles/Culex only) or Pacific islands (Aedes). This diversity requires region-specific vector control strategies. ### Why NOT Aedes Species? **Warning:** Aedes aegypti and Aedes albopictus transmit **dengue and chikungunya**, NOT lymphatic filariasis. This is a common NEET PG trap. **Mnemonic:** **CFAM** = **C**ulex, **F**ilaria, **A**nopheles, **M**ansonia — the three LF vectors in India. ### NVBDCP Filaria Control Strategy 1. **Mass Drug Administration (MDA):** Annual single-dose DEC (diethylcarbamazine) + albendazole to entire endemic population 2. **Vector control:** Insecticide-treated bed nets, indoor residual spraying (IRS) 3. **Morbidity management:** Lymphoedema care, hydrocele surgery **Clinical Pearl:** Culex quinquefasciatus is the most efficient vector in India (highest microfilaremia rates) and is responsible for urban LF transmission. [cite:Park 26e Ch Communicable Diseases; NVBDCP Filaria Elimination Guidelines]
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