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Antimicrobial resistance (%) of E. coli isolated from San Pedro River. A total of 150 isolates were characterized by antimicrobial susceptibility assay. aAm, ampicillin; Cb, carbenicillin; Cl, chloramphenicol; Pef, pefloxacin; Lev, levofloxacin; Sxt, trimethoprim-sulfamethoxazole; G, gentamicin; Net, netilmicin; Ak, amikacin; Cf, Cephalotine; Ctx, cephatoxim; Cro, ceftriaxone; Nf, nitrofuratoin.
