Table 3.

Means ± DS of the CFU/mL of the main species detected at T0, T1 and T2, respectively.

Species*	T0	T1	Z	P**	T0	T2	Z	P**
Staph.aureus stock a	28,23 (± 53,96)	5,48 (± 5,10)	-3,455	0,0005	28,23 (± 53,96)	3,07 (± 6,08)	-4,512	0,0001
Staph.aureus stock b	5,23 (± 9,13)	3,46 (± 3,30)	-0,105	0,916	5,23 (± 9,13)	2 (± 4,88)	-2,521	0,011
Candida	5,95 (± 5,20)	1,8 (± 1,00)	-3,267	0,0011	5,95 (± 5,20)	2,25 (± 3,04)	-1,792	0,07

*For Branhamella catarrhalis, Neisseria meningitidis, Klebsiella pneumoniae, Haemophilus, Diplococcus pneumoniae and Streptococcus pyogenes

CFU/mL values were found in little number of patients and quantity, not adequate for statistical analysis.

**by means of Wilcoxon Signed Rank Test.