Aerosol parameter; mean* (95% CI)n‡GNB aerosol (CFU)n‡ S. aureus aerosol (CFU)P values
Distance (m)
21411 (4 to 28)95 (2 to 10)0.22
41120 (7 to 50)87 (2 to 23)0.14
Duration (min)
51013 (4 to 38)83 (1 to 8)0.062
15§910 (3 to 32)64 (2 to 7)0.12
45§912 (3 to 40)44 (1 to 12)0.10
  • *Geometric mean.

  • †18 GNB organisms identified from the sputum of 15 participants (three participants had two GNB species detected).

  • ‡Target organisms identified in sputum that had a positive aerosol detected.

  • §One GNB group participant did not complete the 15 and 45 min duration experiments.

  • CFU/mL, colony forming units per millilitre of sputum; GNB, Gram-negative bacteria.