Infectious diarrhea secondary to Enteromonas hominis

A patient with persistent abdominal cramps and diarrhea was found to be infected with Enteromonas hominis. A thorough search to detect coinciding infection with other pathogens was unrevealing. Treatment with metronidazole resulted in resolution of the patient's symptoms and eradication of E. hominis from the stool, suggesting E. hominis as the causal organism. Although this flagellate has been classified as a non-pathogen, this case suggests that it should be considered as an occasional pathogen.