A Bad Case of the Flu

A 51-year-old man who was normally fit and well, presented with a one-week history of fever, cough, shortness of breath, myalgia and diarrhoea. On examination he was febrile at 37.8°C, acutely short of breath with oxygen saturations of 75% on 15L of oxygen via a non re-breath mask and a respiratory rate of 25.