A 5-year-old girl from Bangalore presents on day 5 of fever with abdominal pain, persistent vomiting, and lethargy. Her blood pressure is 95/60 mmHg (normal for age: 105/70), pulse 110/min, and capillary refill 2.5 seconds. Platelet count is 45,000/μL, haematocrit 48% (baseline 40%), and AST 280 U/L. Chest X-ray shows a small right-sided pleural effusion. What is the most appropriate immediate intervention?

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