## Clinical Context This is an uncomplicated P. vivax malaria case with moderate parasitemia (0.8%) and no signs of severe malaria (no altered consciousness, no organ dysfunction, no jaundice). ## Diagnostic Confirmation **Key Point:** Schüffner's stippling on thin smear and ring forms are pathognomonic for P. vivax. The parasitemia of 0.8% is below the 1% threshold for severe malaria. ## Treatment Algorithm for P. vivax | Parameter | Uncomplicated P. vivax | Severe P. vivax | |-----------|------------------------|------------------| | **Initial therapy** | Oral chloroquine 600 mg base stat, then 300 mg at 6, 24, 48 hrs | IV artesunate 2.4 mg/kg at 0, 12, 24 hrs, then daily | | **Hypnozoite eradication** | Primaquine 0.5 mg/kg/day × 14 days (after 3 days of chloroquine) | Primaquine after clinical recovery | | **Admission needed?** | No (unless vomiting/inability to tolerate oral) | Yes | **High-Yield:** In India, P. vivax remains chloroquine-sensitive in most endemic regions (Odisha, Jharkhand, Northeast). Artemisinin derivatives are reserved for severe malaria or P. falciparum. ## Why Primaquine After Chloroquine? **Clinical Pearl:** Chloroquine eliminates erythrocytic schizonts (symptomatic parasites); primaquine targets hypnozoites in the liver (the cause of relapses in P. vivax). Giving primaquine too early (before chloroquine clears erythrocytic parasites) increases risk of hemolysis without added benefit. **Mnemonic:** CQ then PQ — **Chloroquine Quells, Primaquine Prevents relapse** ## Why Not IV Artesunate? Parasitemia is 0.8% (uncomplicated). IV artesunate is indicated only when parasitemia ≥1%, signs of severe malaria (cerebral, acute kidney injury, severe anemia, pulmonary edema, shock), or inability to tolerate oral medication. ## Why Not Lumbar Puncture? No signs of cerebral malaria (patient is alert, no altered sensorium, no seizures). LP is not indicated in uncomplicated malaria. 
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