Extended-spectrum beta-lactamases found in Escherichia coli isolates obtained from blood cultures and corresponding stool specimen.

With extended-spectrum β-lactamases (ESBLs) and CTX-M enzymes being on the rise, antimicrobial treatment of enterobacterial infections is becoming more and more challenging. Our study aimed at a molecular characterization of phenotypically ESBL-positive E. coli strains obtained from blood cultures of patients of the University Hospital of Leipzig (UKL), Germany.