The production of African traditional beers remains one of the major economic activities. However, the production of these beverages can be a source of uncomforting, including poisoning or intoxication, once not well done. Foodborne diseases are caused by contamination of food and occur at any stage of the food production, delivery, and consumption chain. Rwanda Biomedical Centre was informed of an outbreak of a gastrointestinal illness among participants of social events at NYAMAGABE and GICUMBI Districts.