CTX-M-15-producing urinary Escherichia coli O25b-ST131-phylogroup B2 has acquired resistance to fosfomycin

Abstract

Fosfomycin resistance in urinary E. coli has increased due to the acquisition of this resistance by a previously circulating CTX-M-15-producing E. coli O25b-ST131-phylogroup B2 strain. This happened during a period when the use of fosfomycin increased by 50%.