Researchers at the National Taiwan University report on a case history of a 34-year old Filipino man who developed heart failure following heart valve surgery. The heart failure was followed by persistent diarrhea and sepsis. Infectious disease testing, which included testing for viruses, E. histolytica, and C. diff failed to identify any pathogen other than Blastocystis. Symptoms resolved following treatment with metronidazole. The paper was published in the International Journal of Surgical Case Reports.