Late shunt infections

We reviewed the records of the 957 shunt-related operations performed at Cardinal Glennon Children's Hospital over a 10-year period. During that time, 94 shunt infections were recognized. Eight of the infections occurred more than 9 months postoperatively. These differed from early infections in two ways: (1)Staphylococcus aureus was not found to be a pathogen in any late infection. (2)Abdominal pseudocysts were much more frequently found in patients with late-developing infections. In addition, the pathogens involved and the temporal distribution of cases suggest most infections that occur more than 9 months postoperatively are more likely caused by secondary bacterial seeding than by bacterial inoculation at the time of operation.