Table 3.

Measurement of planktonic and adhering cell fractions for the 52 clinical isolates and the 11 laboratory strains.

Microbial strains	Planktonic CFU/mL	Planktonic doubling time (min)	Adherent CFU/mL	Adherent doubling time (min)	AI (*)
P. aeruginosa	1.2 × 107 ± 8.8 × 106	43.5	1.5 × 106 ± 1.5 × 106	77.0	1.77
K. pneumoniae	3.2 × 107 ±7.5 × 106	36.1	1.6 × 106 ± 1.3 × 106	75.6	2.09
R. mannitolilytica	2.5 × 107 ± 8.3 × 106	37.7	3.8 × 105 ± 2.9 × 105	155.9	4.13
S. aureus	3.3 × 107 ±1.5 × 107	35.9	2.2 × 106 ± 1.5 × 106	67.6	1.88
S. epidermidis	2.1 × 107 ± 1.2 × 107	38.7	2.0 × 106 ± 1.3 × 106	69.1	1.78
Other Gram+	2.9 × 107 ± 3.3 × 107	36.6	2.4 × 106 ± 1.5 × 106	65.6	1.79
Average	2.5 × 107 ± 9.7 × 106	37.6	1.7 × 106 ± 7.4 × 105	73.5	1.97

^(*)Adherence index (AI) was calculated as the ratio between the doubling time for the adherent fraction vs. the doubling time of the planktonik fraction.