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The proportion of gram-negative pathogens with resistance to broad-spectrum cephalosporins — a surrogate marker for extended-spectrum β-lactamase production — is rapidly increasing. Previous reports have indicated that such resistance worsens outcomes in patients with bacteremia, but is this also true for patients with intra-abdominal infections?
To find out, researchers in South Korea conducted a retrospective, multicenter study involving patients who were treated for bacteremic gram-negative intra-abdominal infections between 2006 and 2009 (n=365).
Biliary tract infection was the most common source of bacteremia (56%), followed by peritonitis (17%) and intra-abdominal abscess (15%). The pathogens isolated from blood cultures were Escherichi…