A 30-year-old man with a history of cystic fibrosis presents to the GP with a 5-day history of worsening productive cough and fever. Which of the bacteria is likely to be the cause of his pneumonia?

d. Psuedomonas is a common pathogen in those patients suffering with cystic fibrosis and bronchiectasis. It is often associated with an increasing mortality and a general deterioration in their clinical condition. The treatment is usually with antipseudomonal penicillins, e.g. piperacillin.