Antibiotic susceptibility of Lactobacillus sp. isolated from commercial probiotic products by E-test strip method

Minimum Inhibitory Concentration (MIC) of 29 Lactobacillus isolates was determined by E-test strip method according to CLSI and EFSA, 2012 standards. All isolates displayed resistance towards aminoglycosides while 63% of isolates were found resistant to amikacin (MIC 16-256 µg/ml). Strains S8a and S8b (L. rhamnosus and L. acidophilus) were resistant to tetracycline (MIC 256 µg/ml).