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A child — 4 days fever, then abdominal pain and vomiting; dengue warning; fluids titrated. Dengue in children (Aedes — febrile 2–7 days → critical phase — plasma leakage: warning signs — abdominal pain, persistent vomiting, fluid accumulation, mucosal bleed, lethargy, liver enlargement, rising hematocrit: NS1 — day 1–5; IgM — later: manage — paracetamol only — no NSAIDs/aspirin; fluids — titrated to hematocrit/urine; severe — shock, severe bleeding — ICU): malaria (falciparum — severe — cerebral, anemia — children vulnerable: RDT; ACT — artemether-lumefantrine; severe — IV artesunate; vivax — chloroquine + primaquine). The defervescence danger — warning signs appear as fever falls.