Enterococcus faecium Isolates Present in Human Breast Milk Might Be Carriers of Multi-Antibiotic Resistance Genes

Using Enterococcus faecium strains as probiotics raises several controversies related to their antibiotic resistance (AR). In the current study, we examined isolates of E. obtained from human breast milk. Catalase-negative and γ-haemolytic were identified by analyzing sequences 16S rRNA gene phenotypic antibiotics was investigated. We expression genes that found on plasmids. The majority tested resistant erythromycin (96%), followed trimethoprim (67%), tetracycline (57%), gentamicin (55%). Ninety-seven percent at least two antibiotics. detected presence following plasmids: ErmB (erythromycin), dfrA17 (trimethoprim), tetO, tetK (tetracycline), Aph(3′)-IIIa (neomycin), marA (rifampicin). TetO not expressed in all cases, dfrA14 CDCP1449, while only CDCP1128 CDCP1331 isolates. isolates, AR located chromosomes since they Our study shows due spread AR, milk could be one first sources bacteria antimicrobials infants.