## Lymphatic Filariasis: Vector and Transmission in India **Key Point:** Culex quinquefasciatus is the primary vector of lymphatic filariasis in India, transmitting *Wuchereria bancrofti* via nocturnal subperiodic microfilaremia. ### Vector-Specific Characteristics | Vector | Microfilaremia Pattern | Geographic Distribution | Transmission Timing | |--------|------------------------|-------------------------|--------------------| | **Culex quinquefasciatus** | Nocturnal subperiodic | Urban/semi-urban India | Night (peak 22:00–02:00) | | Anopheles | Periodic (night-biting) | Coastal/endemic areas | Night | | Aedes | Diurnal periodic | Pacific islands (rare in India) | Daytime | | Mansonia | Subperiodic | Swamp regions (rare in India) | Variable | **High-Yield:** The nocturnal subperiodic pattern of *W. bancrofti* in Culex-endemic areas means: - Microfilaremia peaks at night (adaptation to vector feeding behavior) - Blood sampling for diagnosis must be done at night (10 PM–2 AM) - Transmission occurs when infected mosquitoes take blood meals **Clinical Pearl:** In India, *Wuchereria bancrofti* transmitted by Culex accounts for ~99% of lymphatic filariasis cases. The subperiodic pattern (low daytime levels, high nocturnal levels) is distinct from the periodic pattern seen in some endemic regions. **Mnemonic:** **CuNOC** — **Cu**lex transmits *W. bancrofti* with **NOC**turnal subperiodic microfilaremia. [cite:Park 26e Ch 8]
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