Detection of novel oxazolidinone and phenicol resistance gene optrA in enterococcal isolates from food animals and animal carcasses.

•Overall, 12 Enterococcus faecalis and 27 E. faecium were resistant to linezolid.•The optrA gene was found in all 12 E. faecalis and 23 E. faecium isolates.•Among them, 30 optrA-positive isolates co-carried phenicol exporter gene fexA.•First report of optrA gene in isolates from cattle and animal carcasses.•Fist report of optrA in Korea indicating the emergence of optrA in a new setting.