TABLE 3.

Minimum inhibitory concentration (MIC) range, MIC₅₀ and MIC₉₀ of 111 L. monocytogenes isolates.

Antibiotic	MIC range (mg/L)	MIC50 (mg/L)	MIC90 (mg/L)	%S
Penicillin	0.03-1	0.25	0.50	100
Ampicillin	≤ 0.12-1	0.50	0.50	100
Amoxicillin - clavulanic acid	≤ 0.50/0.25	≤0.50/0.25	≤ 0.50/0.25	100
Meropenem	≤ 0.25	≤0.25	≤ 0.25	100
Erythromycin	≤ 0.25- > 16	≤0.25	≤ 0.25	100
Trimethoprim-sulfamethoxazole	≤ 0.5/9.5	≤0.5/9.5	≤ 0.5/9.5	100a
Levofloxacin	0.5-4	2	2	NA

NA = EUCAST breakpoints not available; ^aFor trimethoprim-sulfamethoxazole, Clinical & Laboratory Standards Institute (CLSI) clinical breakpoints were used.