In late June 2012, the town hall of Arâches-La Frasse reported that approximately 30 students were absent due to acute gastroenteritis (AGE), one of whom was hospitalized. During the preliminary investigation, several hypotheses were put forward, including contamination of the drinking water. This possibility was ruled out following an environmental investigation. Stool cultures revealed the presence of Salmonella, which helped guide the investigation. Following an epidemiological investigation involving the students and their parents, parent-teacher associations, the village doctor, and the local pharmacy, a mass foodborne illness outbreak was identified. This was linked to a school celebration meal held on June 23. A cohort study was conducted among the participants in this meal (47 ill and 56 healthy individuals). This analysis, combined with the investigation by veterinary services, established a link between the ill individuals and the consumption of spit-roasted ham. The human and food strains were subtyped using CRISPR analysis by the National Reference Center (NRC) for Salmonella and the National Reference Laboratory (NRL) for Salmonella, and then compared. They shared the same profile, Salmonella Typhimurium DT104 CT30, confirming the link between the consumption of the hams and the cases of salmonellosis. It is likely that the hams were contaminated during handling after roasting.