Table 1.

Data related to microbiological analyses performed to check for contamination of the culture medium collected from each sterility maintenance experiment Neg.: negative result (i.e., zero colonies found). For the test configurations refer to Figure 2.

Test		Plate Count Agar solid medium	Chocolate Agar + PolyViteX solid medium	Brain Heart Infusion broth
1	(a)	Neg.	Neg.	Neg.
	(b)	Neg.	Neg.	Neg.
2	(c)	Neg.	Neg.	Neg.
	(d)	Neg.	Neg.	Neg.
3	(e)	Neg.	Neg.	Neg.
	(f)	Neg.	Neg.	Neg.