A 16-yr-old female presented to the emergency department with a two-day history of fever up to 39°C, sore throat, productive cough and malaise. Initially a diagnosis of acute tonsillitis was made and the patient was treated for a seven-day period with penicillin. Unfortunately the patient remained febrile up to 38°C, with persistent productive cough and malaise. Ten days after her first visit she was admitted to the pulmonary department for further evaluation. The patient until then had no significant medical history.