## Epidemiology of Malaria in India **Key Point:** Plasmodium vivax is the most common malaria parasite in India, accounting for approximately 50–60% of all confirmed malaria cases, followed by P. falciparum (35–40%). ### Distribution Pattern | Plasmodium Species | Prevalence in India | Geographic Distribution | Clinical Features | | --- | --- | --- | --- | | **P. vivax** | 50–60% (most common) | Pan-India, especially foothills, plains | Benign tertian fever, relapse due to hypnozoites | | P. falciparum | 35–40% | South India, central India, endemic zones | Severe malaria, cerebral involvement, high mortality | | P. malariae | <5% | Sporadic, localized foci | Quartan fever (72-hour cycle) | | P. ovale | Rare | Very limited distribution in India | Tertian fever, rare in Indian subcontinent | ### NVBDCP Focus Areas **High-Yield:** The NVBDCP prioritizes surveillance and control of both P. vivax and P. falciparum, but P. vivax remains the epidemiological challenge due to: - Higher transmission efficiency in temperate and subtropical zones - Presence of hypnozoites causing relapses (weeks to months after primary infection) - Difficulty in complete elimination without targeting liver stage **Clinical Pearl:** P. vivax malaria, though classically described as "benign," can cause severe complications including acute respiratory distress syndrome (ARDS), acute kidney injury, and cerebral malaria in a subset of patients—a paradigm shift in recent years. **Mnemonic:** **PV-VIVAX** = **P**lasmodium **V**ivax is the **V**ery **I**mportant **V**ector-borne **A**cute fe**X**er in India. ### NVBDCP Strategy 1. Artemisinin-based combination therapy (ACT) for treatment 2. Insecticide-treated nets (ITNs) and indoor residual spraying (IRS) for vector control 3. Primaquine for radical cure of P. vivax (targeting hypnozoites) 4. Surveillance and case management in endemic districts [cite:Park 26e Ch 7]
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