. 2020 Apr 11;8(4):551. doi: 10.3390/microorganisms8040551

Table 1.

Susceptibility of Enterococcus faecium to cationic biocides tested by a customized microtiter plate (MERLIN Diagnostika GmbH).

Biocide (Concentration Range Tested)	Species	Number of Isolates with MIC Value (mg/L) of							MIC₉₅	Number of Isolates with MBC Value (mg/L) of							MBC₉₅
Biocide (Concentration Range Tested)	Species	0.25	0.5	1	2	4	8	16	MIC₉₅	0.25	0.5	1	2	4	8	16	MBC₉₅
BAC (0.5–256 mg/L)	VSE			1		11	36		8						41	7	16
BAC (0.5–256 mg/L)	VRE					15	27		8						42		8
CHX (0.25–128 mg/L)	VSE		1	2	35	10			4				2	1		45	16
CHX (0.25–128 mg/L)	VRE			1	41				2				3	1	3	35	16
CTP (1–256 mg/L)	VSE			3 *	17	28			4					48			4
CTP (1–256 mg/L)	VRE				11	31			4					42			4
DDAC (0.5–128 mg/L)	VSE		1 ^#	25	22				2				48				2
DDAC (0.5–128 mg/L)	VRE			26	16				2			2	40				2
OCT (0.125–32 mg/L)	VSE		1	8	39				2				22	26			4
OCT (0.125–32 mg/L)	VRE			4	38				2				22	20			4

Biocide concentrations which have not been tested are shaded in gray. BAC = benzalkonium chloride, CHX = chlorhexidine dihydrochloride, CTP = cetylpyridinium chloride, DDAC = didecyldimethylammonium chloride, OCT = octenidine dihydrochloride, VRE = vancomycin resistant Enterococcus faecium, VSE = vancomycin susceptible Enterococcus faecium, ^# MIC ≤ 0.5, * MIC ≤ 1.