The decision to perform chest imaging in these patients was entirely at the discretion of the attending doctors at the Accident and Emergency Unit and, subsequently, doctors from the Respiratory and Infectious Disease Units based on the clinical severity of the patients. Out of the total, 48 patients including pregnant women were deemed not necessary to have any form of imaging. The chest radiographic images obtained from the 118 patients were reviewed by two staff radiologists, who have more than 10 years postgraduate experience, via consensus reading and the patterns recorded. Serial radiographs of patients with progressive clinical signs were also reviewed to assess disease progression and response to treatment by the Infectious Disease Unit team of doctors. Chest CT, which was performed on select cases based on severity and treatment response, were also read and the findings noted. The clinical data of the afflicted patients were obtained from the Hospital Infectious Disease Unit and compiled using Microsoft Office Excel (2003).