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Background  The aim was to evaluate the value of organ-specific weighted incidence antibiogram (OSWIA) percentages for bacterial susceptibilities of Gram-negative bacteria (GNB) collected from intra-abdominal infections (IAIs) during SMART 2010–2014.    Methods  We retrospectively calculated the OSWIA percentages that would have been adequately covered by 12 common antimicrobials based on the bacterial compositions found in the appendix, peritoneum, colon, liver, gall bladder and pancreas.    Results  The ESBL positive rates were 65.7% for  Escherichia coli , 36.2% for  Klebsiella pneumoniae , 42.9% for  Proteus mirabilis  and 33.1% for  Klebsiella oxytoca. Escherichia coli  were mainly found in the appendix (76.8%), but less so in the liver (32.4%).  Klebsiella pneumoniae  constituted 45.2% of the total liver pathogenic bacteria and 15.2–20.8% were found in 4 other organs, except the colon and appendix (< 10%). The percentages of  Pseudomonas aeruginosa  infections were higher in the gall bladder, intra-abdominal abscesses, pancreas and colon (10.2–13.2%) and least (5.4%) in the appendix. The susceptibilities of hospital acquired (HA) and community acquired (CA) IAI isolates from appendix, gall bladder and liver showed ≥80% susceptibilities to amikacin (AMK), imipenem (IPM), piperacillin-tazobactam (TZP) and ertapenem (ETP), while the susceptibility of isolates in abscesses and peritoneal fluid showed ≥80% susceptibility only to amikacin (AMK) and imipenem (IPM). In colon CA IAI isolates susceptibilities did not reach 80% for AMK and ETP, and in pancreatic IAIs susceptibilities of HA GNBs did not reach 80% to AMK, TZP and ETP, and CA GNBs to IMP and ETP. In addition, besides circa 80% susceptibility of HA and CA IAI isolates from appendix to cefoxitin (FOX), IAI isolates from all other organs had susceptibilities between 7.6 and 67.9% to all cephalosporins tested, 28.3–75.2% to fluoroquinolones and 7.6–51.0% to ampicillin-sulbactam (SAM), whether they were obtained from CA or HA infections.    Conclusion  The calculated OSWIA susceptibilities were specific for different organs in abdominal infections.    Electronic supplementary material  The online version of this article (10.1186/s12879-018-3494-x) contains supplementary material, which is available to authorized users.

bmc infectious diseases

Antimicrobial susceptibilities of specific syndromes created with organ-specific weighted incidence antibiograms (OSWIA) in patients with intra-abdominal infections