Retroperitoneal Abscess

The infection is often polymicrobial. The predominant aerobic and facultative isolates are E. coli, K. pneumoniae, Enterococcus spp., and S. aureus (7). The predominant anaerobes are Peptostreptococcus spp., B. fragilis group, Prevotella spp., and Clostridium spp. The number of anaerobes/site generally outnumbered the number of aerobic or facultative and is especially high in pelvic abscesses. Certain trends in recovery of organisms according to abscess site were noted (Table 3). S. aureus was more commonly isolated from pancreatic and retrofascial abscesses. K. pneumoniae and Pseudomonas aeruginosa were commonly recovered from pancreatic abscesses, Neisseria gonorrhoeae and streptococcus group B were only isolated from pelvic retroperitoneal sites. Prevotella bivia and Prevotella disiens were mostly recovered from pelvic abscesses. Clostridium spp. and Fusobacterium nucleatum predominated in anterior retroperitoneal sites. Propionibacterium acnes was mostly isolated from vascular graft infection. No differences in recovery rates were noted among B. fragilis group, Peptostreptococcus spp., and E. coli isolates. The number of aerobic and facultatives was especially high in pancreatic abscesses (PA; Table 3).

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