Microbiology of sputum and CASS samples
| Infection status prior to study | Expectorated sputum(n = 23) | CASS study Voluntary cough (n = 28)/hypertonic saline (n = 20) | Tidal study(n = 7) | |
| P aeruginosa not isolated | Cleared P aeruginosa (n = 1) | 1 | 3 | 4 |
| P aeruginosa isolated | Chronic P aeruginosa (n = 12 adults, n = 14 children) | 21 | 25* | 3 |
| P aeruginosa (unique) | 5 | 7 | 1 | |
| P aeruginosa (AES2) | 16 | 18 | 2 | |
| B cenocepacia isolated | Chronic B cenocepacia (n = 1) | 1 | 1 | 0 |
AES2, Australian Epidemic Strain 2; CASS, cough aerosol sampling system.
*Five subjects also cultured additional Gram-negative bacteria in cough aerosols (4 Stenotrophomonas maltophilia and 1 Achromobacter xylosoxidans).