Prevalence of Multidrug-Resistant Listeria monocytogenes in Dairy Products with Reduction Trials Using Rosmarinic Acid, Ascorbic Acid, Clove, and Thyme Essential Oils

Table 2

Antimicrobial susceptibility of L. monocytogenes isolated from milk and soft cheeses (n = 15 isolates).

Antimicrobial agents	Antimicrobial group	Sensitive (S)		Intermediate (I)		Resistant (R)
		No.	%	No.	%	No.	%
Streptomycin (S)	Aminoglycosides	—	—	—	—	15	100
Erythromycin (E)	Macrolide	—	—	—	—	15	100
Oxytetracycline (T)	Tetracycline	—	—	2	13.33	13	86.67
Nalidixic acid (NA)	Quinolone	2	13.33	2	13.33	11	73.33
Sulfamethoxazole (SXT)	Sulfonamide	4	26.67	—	—	11	73.33
Cephalothin (CN)	Cephalosporin	1	6.67	3	20	11	73.33
Amikacin (AK)	Aminoglycosides	3	20	1	6.67	11	73.33
Cefotaxim (CF)	Cephalosporin	6	40	—		9	60
Chloramphenicol (C)	Phenicols	4	26.67	4	26.67	7	46.67
Kanamycin (K)	Aminoglycosides	7	46.67	3	20	5	33.33
Neomycin (N)	Aminoglycosides	9	60	1	6.67	5	33.33
Gentamicin (G)	Aminoglycoside	12	80	1	6.67	2	13.33
Ampicillin (AM)	β-lactam	13	86.67	—		2	13.33
Ciprofloxacin (CP)	Fluoroquinolone	11	73.33	3	20	1	6.67