Yes, E.coli, as in the frequent bathroom visit kind.
“20 year old medical student participates in an extraordinary research project at Haukeland University Hospital, where healthy students voluntarily get infected with E. coli bacteria. Then students’ stool samples are evaluated for developing a vaccine against the disease. Talking to TV2, project researcher Halvor Sommerfelt says that many children in developing countries still die from diarrheal disease, approximately 1.5 to 2 million children annually. This project aims to help developing a vaccine against one of the main causes of diarrhea among children in developing countries.”
“So far, 24 volunteers participated in the project, which is a collaboration between several countries, including the U.S. and Norway.”