## Anopheles Vectors and Urban Malaria in India **Key Point:** Anopheles stephensi is the primary vector of malaria in urban and semi-urban areas of India, thriving in man-made water collections and urban habitats. ### Distribution and Breeding Characteristics of Major Vectors | Anopheles Species | Habitat | Geographic Distribution | Breeding Sites | | --- | --- | --- | --- | | A. stephensi | Urban/semi-urban | Cities, towns, coastal areas | Overhead tanks, cisterns, wells, construction pits | | A. culicifacies | Rural | Plains and foothills | Streams, canals, seepage water | | A. fluviatilis | Rural | Hilly/forested areas | Fast-flowing streams, rocky areas | | A. sundaicus | Coastal | Coastal regions (rare in mainland) | Brackish water, coastal swamps | ### Epidemiological Significance of A. stephensi 1. **Urban adaptation** — Breeds in artificial water collections (overhead tanks, cisterns, construction sites). 2. **High human contact** — Endophilic (rests indoors) and anthropophilic (prefers human hosts). 3. **Efficient vector** — Competent for both P. vivax and P. falciparum transmission. 4. **Insecticide resistance** — Increasing resistance to pyrethroids and DDT in some urban centers. **High-Yield:** A. stephensi is responsible for urban malaria outbreaks in Indian cities like Delhi, Mumbai, Bangalore, and Chennai. Control focuses on eliminating breeding sites in overhead tanks and construction areas. **Mnemonic:** **STEP** = **S**tephensi = **T**owns/**U**rban/**E**levated water tanks/**P**erfect vector for urban malaria. **Clinical Pearl:** Urban malaria in India is increasingly recognized as a public health problem, with A. stephensi being the culprit. Surveillance and vector control in cities are now priority areas in national malaria elimination programs.
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