Table 1.

Recovery of P. aeruginosa biofilm with each test solution^a

Tube portion sampled (n = 7)	Bacteria recovered from each tube portion (log10 CFU/cm2)b
	Letheen broth		Saline solution (0.9%)		Sterile water
	Bacteria recovered	Ratio	Bacteria recovered	Ratio	Bacteria recovered	Ratio
Tube portion
1	7.50	0.91	7.11	0.82	6.48	0.85
2	7.79	0.95	7.09	0.81	6.88	0.90
3	7.67	0.93	6.77	0.77	6.56	0.86
4	7.50	0.91	7.11	0.82	6.59	0.86
5	7.53	0.92	7.12	0.82	6.01	0.79
6	7.83	0.95	7.12	0.82	6.02	0.79
7	7.80	0.95	7.31	0.84	6.50	0.85
Mean ± SD	7.66 ± 0,15	0.93 ± 0.02	7.09 ± 0.16	0.81 ± 0.02	6.43 ± 0.32	0.84 ± 0.04

^aThe mean logarithmic counts in control samples (n = 3) for biofilm ± the standard deviation (log₁₀ CFU/cm²) for Letheen broth, saline solution, and sterile water were 8.20 ± 0.06, 8.71 ± 0.28, and 7.64 ± 0.21, respectively. The percentages of biofilm recovery (CFU/cm²) in these control samples for Letheen broth, saline solution, and sterile water were 30.1 (4.8 × 10⁷/1.6 × 10⁸), 2.2 (1.3 × 10⁷/5.8 10⁸), and 7.1 (3.3 × 10⁶/4.7 × 10⁷), respectively. The percent biofilm recovery for each sampling solution was calculated using the mean bacterial count (CFU/cm²) obtained for the seven portions with the test solution as the numerator and the mean bacterial count (CFU/cm²) recovered from the three tube control portions as the denominator.

^bThe logarithmic ratio for each tube portion was calculated as the bacterial count (log₁₀ CFU/cm²) recovered by the tested solution in each tube portion as the numerator and the mean bacterial count (log₁₀ CFU/cm²) recovered from the three tube control portions as the denominator.