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[Shewanella algae bacteremia in patients with biliary tract malignancy: report of three cases].

We encountered three cases of Shewanella algae bacteremia in patients with biliary tract malignancy. Shewanella species are mainly found in seawater and other watery environments. Human infections caused by Shewanella species have been rare. However, reports of Shewanella infections are increasing, although only a few have been from Japan. The three patients we encountered had common features, including hepatobiliary malignancy, male sex, and age over 60 years. These features are similar to those in reports from elsewhere. Shewanella infection bears consideration in patients with those characteristics who have a history of exposure to sea or fresh water or ingestion of seafood. Prompt treatment is needed as the mortality rate of this infection is high.