Antibiotics
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A 28-year-old man was transferred to our hospital and underwent surgery for resection of an aortic graft infected with Klebsiella pneumoniae . Antimicrobial therapy consisted of amikacin, cefazolin, chloramphenicol, sulfamethoxazole, and trimethoprim. A request for amikacin and sulfamethoxazole assays was received by the laboratory along with information that the patient had received tobramycin until 24 h before the serum was obtained.