Ibuprofen (Nurofen*) is known as an effective medication to reduce fever in infectious illnesses and is even considered as superior to paracetamol. It has no immunosuppressive effect and is usually well tolerated by children with very few side effects when taken in the normal therapeutic dose of 10mg/Kg. The investigators postulate that a dose of Nurofen prior to bronchoscopy could significantly reduce fever post bronchoscopy.