Figure 1.

Antimicrobial resistance profiles of the STEC isolates. Three regions sampled are Beijing city (in blue), Chongqing city (in red), Guizhou province (in green). Statistical test was only performed between Chongqing and Beijing. A *and** were placed above the histogram for Chonqing samples if P < 0.05 and P < 0.001 respectively. Antibiotics abbreviations are: AMP, Ampicillin; PIP, Piperacillin; AMC, Amoxicillin-clavulanic acid; SAM, Ampicillin-sulbactam; FEP, Cefepime; CTX, Cefotaxime; CRO, Ceftriaxone; KF, Cephalothin; CXM, Cefuroxime; ATM, Aztreonam; IPM, Imipenem; MEM, Meropenem; GM, Gentamicin; K, Kanamycin; S, Streptomycin; TE, Tetracycline; CIP, Ciprofloxacin; NOR, Norfloxacin; LVX, Levofloxacin; NA, Nalidixic acid; SXT, Trimethoprim-sulfamethoxazole; C, Chloramphenicol; F, Nitrofurantoin.