KA, a 7-month-old Malay boy, was admitted to the hospital due to shortness of breath, coughing, and vomiting. On examination, he showed signs of respiratory distress including rapid breathing and recession of the ribs. Auscultation revealed widespread crackles and wheezes throughout both lungs. A provisional diagnosis of pneumonia was made, with bronchiolitis and asthma considered as differentials. Blood tests and renal function were normal.