## Epidemiology of Malaria in India **Key Point:** Plasmodium vivax is the predominant malaria parasite in India, accounting for approximately 50–60% of all malaria cases, though regional variation exists. ### Geographic Distribution in India | Plasmodium Species | Prevalence in India | Geographic Pattern | Clinical Significance | | --- | --- | --- | --- | | P. vivax | 50–60% | Pan-India, especially foothills, tribal areas | Benign tertian fever, relapse risk | | P. falciparum | 30–40% | South India, tribal zones, high-altitude areas | Severe malaria, cerebral involvement, high mortality | | P. malariae | 5–10% | Sporadic, localized foci | Quartan fever, chronic infection | | P. ovale | <1% | Rare, imported cases | Benign tertian fever, limited transmission | **High-Yield:** The National Vector Borne Disease Control Programme (NVBDCP) data consistently shows P. vivax as the leading cause. However, P. falciparum prevalence is rising in certain endemic zones (Odisha, Chhattisgarh, Jharkhand). ### Clinical Correlation **Clinical Pearl:** P. vivax causes benign tertian malaria (fever every 48 hours) with lower mortality but carries the risk of relapses due to hypnozoites in the liver. This makes radical cure with primaquine essential. **Warning:** Do not confuse prevalence with severity. Although P. vivax is more common, P. falciparum causes more severe disease and complications (cerebral malaria, acute kidney injury, severe anemia). ### Mnemonic for Indian Malaria Epidemiology **VIVAX-India:** Vivax is the most common, followed by Falciparum (increasing trend), then Malariae (rare), Ovale (very rare).
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