Table 1. List of indicator strains

	Strains	Collection no.	Culture media
Gram+	Staphylococcus aureus	KCCM 11335	Tryptic soy broth
	Staphylococcus aureus	KCTC 3881	Tryptic soy broth
	Staphylococcus epidermidis	KCTC 1917	Luria bertani broth
Gram-	Escherichia coli	KCTC 2571	Luria bertani broth
	Escherichia coli	KCTC 1039	Luria bertani broth
	Pseudomonas aeruginosa	KCTC 2513	Tryptic soy broth
Fungi	Candida albicans	KCTC 7270	Yeast malt broth
	Candida albicans	KCTC 7965	Yeast malt broth