1st April 2022

A 50-year-old male presents with acute breathlessness over the past 3 days

A 50-year-old male presents with acute breathlessness over the past 3 days. He complains of coughing up green sputum and one occasion of haemoptysis. He admits to smoking heavily and drinking excessive amounts of alcohol. He denies any foreign travel. His observations were RR 30 bpm, HR 90 bpm, O₂ saturation 93% on room air, temperature 38°C, BP 110/60 mmHg. A chest X-ray reveals cavitating lesions in the upper lobes. 

Which of the following organisms is the most likely cause of his pneumonia?

Select the SINGLE most appropriate option from the list below. Select ONE option only.