## Entomological Inoculation Rate and Transmission Zones in India **Key Point:** The entomological inoculation rate (EIR) is the number of infective mosquito bites per person per unit time (typically expressed as bites per person per year). Higher EIR corresponds to higher transmission zones. ### Indian Malaria Transmission Zones (NVBDCP Classification) | Transmission Zone | EIR Range | Characteristics | Geographic Distribution | | --- | --- | --- | --- | | Malaria-free zone | 0 | No malaria transmission | Himalayan foothills, high-altitude areas | | Low transmission zone | < 1 bite/person/year | Sporadic cases; mostly P. vivax | Parts of North India, urban areas | | Moderate transmission zone | 1–10 bites/person/year | Regular transmission; mixed species | Parts of Central and Eastern India | | High transmission zone | > 10 bites/person/year | Intense transmission; predominantly P. falciparum | Western Ghats, Northeastern states, parts of Odisha, Jharkhand | **High-Yield:** The high transmission zone has the highest EIR (>10 infective bites per person per year) and is associated with: - Dense mosquito populations (especially *Anopheles culicifacies* and *A. fluviatilis*) - High prevalence of P. falciparum - Forested and tribal areas - Highest malaria burden and mortality **Clinical Pearl:** EIR is a critical epidemiological indicator for resource allocation, vector control intensity, and surveillance strategies. Areas with EIR >10 require the most aggressive intervention programs. **Mnemonic:** **HT-EIR** — High Transmission zone has the highest EIR (>10 bites/person/year); this is where most malaria deaths and severe cases occur in India.
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