Characteristics and antimicrobial susceptibility profiles of ESBL-producing <i>Enterobacteriaceae</i> isolated from cattle younger than 2

<p><b>years.</b> Symbols: black square, positive result or resistant to a specific antimicrobial agent; white square, negative result or susceptible to a specific antimicrobial. Abbreviations: AM, ampicillin (resistant ≤13 mm); AMC, amoxicillin-clavulanic acid (resistant ≤13 mm); CF, cephalothin (resistant ≤14 mm); CXM, cefuroxime (resistant ≤14 mm); FOX, cefoxitin (resistant ≤14 mm); CPD, cefpodoxime (resistant ≤17 mm); CTX, cefotaxime (resistant ≤14 mm); CAZ, ceftazidime (resistant ≤14 mm); FEP, cefepime (resistant ≤14 mm); GM, gentamicin (resistant ≤10 mm); S, streptomycin (resistant ≤11 mm); SXT, trimethoprim-sulfamethoxazole (resistant ≤10 mm); TE, tetracycline (resistant ≤11 mm); NA, nalidixic acid (resistant ≤13 mm); CIP, ciprofloxacin (resistant ≤15 mm); C, chloramphenicol (resistant ≤12 mm). Discrimination between “susceptible” and “resistant” was strictly according to CLSI interpretive criteria. It should be noted, however, that for clinical and therapeutic purposes, ESBL producers should generally be reported resistant to cephalosporins of all 4 generations and monobactams.