Table 1.

MICs of chlorhexidine and isopropanol by the study sample’s characteristics

Characteristic	Chlorhexidine MIC (µg/mL)			p-value	Isopropanol MIC (mg/mL)			p-value
	MIC50	MIC90	Range		MIC50	MIC90	Range
All	32	64	8–128		64	128	16–256
Institution
INMP	16	64	8–128	0.123	64	128	32–256	0.084†
HNGAI	64	128	8–128		64	128	16–256
HN2M	32	64	16–64		32	64	32–64
Sample source
Fomite	32	64	16–64	0.541	32	64	32–64	0.038‡
Blood/Secretions	32	128	8–128		64	128	16–256
Clonality
Negative	16	64	8–128	0.192	64	128	16–64	0.239
Positive	64		16–256		32		32–64
Carbapenemases
Absence	16	64	8–128	0.071†	64	128	32–256	0.455
Presence	64	128	8–128		64	128	16–256

MIC, Minimal inhibitory concentration; INMP, Instituto Nacional Materno Perinatal; HNGAI, Hospital Nacional Guillermo Almenara Irigoyen; HN2M, Hospital Nacional Dos de Mayo; †, p value <0.10; ‡, p value <0.05