In 27 pediatric oncology patients (median age, 2 years) undergoing chemotherapy for malignant tumours, Silastic Broviac catheters were placed to provide vascular access. The catheters were in place for a total of 174 patient-months. There were 14 episodes of Broviac catheter-related bacteremia or fungemia that occurred in six patients: one patient had six bacteremic episodes, one patient had four episodes, and four patients each had one bacteremic episode. Cultures of blood drawn from Broviac catheter were positive in all instances, and in 12 of 14 samples drawn from the peripheral vein. The most common initial symptoms were fever and chills. The species causing the infections were Enterobacter cloacae (three cases), Staphylococcus epidermidis (three cases), Staphylococcus aureus (three cases), Klebsiella pneumoniae (two cases), Escherichia coli (two cases), Pseudomonas dentrificans, Pseudomonas aeruginosa, and Candida tropicalis. Antimicrobials administered through the catheter cured the infection in ten of the 11 cases in which they were used.