Abstract
A previously healthy 15-year-old girl fell ill with febrile gastroenteritis; Plesiomonas shigelloides was isolated from the blood 6 h after she had received one tablet of trimethoprim-sulfadiazine on the third day of symptoms. She recovered uneventfully. P. shigelloides may be isolated from the blood in immunocompetent patients with mild, uncomplicated gastroenteritis.