Figure 2. Patient 4. This child had a history of successfully treated initial P. aeruginosa lower respiratory tract infection and was monitored for the next three years during which time they remained stable. Bronchoalveolar lavage and throat swab samples were available for years one, two and three. Matching sera samples were only available for year one and three. Over the three-year observation period, P. aeruginosa was not cultured in any throat swab or BAL samples and the latter showed minimal signs of airway inflammation.