TABLE 5.

MICs of selected QAC sanitizers

Strain	Cluster or subcluster	Gene(s)	MIC (mg/liter) ofa:			Weiquat MIC (%)
			BC	BZT	CPC
FSL H1-0506	1	None	1	2	1	0.001
FSL M6-0204	1	qacH	3	4	3d	0.004e
FSL H1-0322	2	bcrABC	4b	7c	3d	0.004
FSL T1-0027	3a	bcrABC	3	5	2	0.004
FSL T1-0077	3b	bcrABC	3	6	2	0.004

^aThe MIC is defined as the value at which no growth was detected (at the detection threshold of an OD₆₀₀ of 0.15) for any of the three biological replicates after 24 h of incubation. BC, benzalkonium chloride; BZT, benzethonium chloride; CPC, cetylpyridinium chloride.

^bOne of three biological replicates passed the detection threshold at 3 mg/liter BC.

^cOne of three biological replicates passed the detection threshold at 6 mg/liter BZT.

^dOne of three biological replicates passed the detection threshold at 2 mg/liter CPC.

^eOne of three biological replicates passed the detection threshold at 0.003% Weiquat.