Case presentation An 8-year-old boy was brought to the emergency department with a history of persistent cough, breathlessness, and tiredness. His mother revealed her child had suffered from a dry cough for two days. Examination   Laboratory results  Hemoglobin: 11.2 g/dL TLC: 8,800 cell/cu mm DLC: P 72 L 18 E 8 M 2 ESR: 24 mm in the first hour AEC: 400 cells/cu mm Chest X-ray: Normal   What is your most probable diagnosis for this boy?

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