In 2007, a cholera epidemic occurred on two of the three islands of the Comoros archipelago: Grande Comore and Moheli. This study is based on data from the files of the 1571 patients admitted to five cholera treatment centers (CTC). The outbreak lasted for ten months. A dramatic peak was observed in July and August corresponding to the traditional wedding season during which hundreds of guests including returning diaspora gather to celebrate "Grand Marriages". Initial stool cultures identified Vibrio cholerae O1, Ogawa serotype. The in-center fatality rate was 1.85%. Poor socio-economical conditions combined with a rapid turnover of health personnel and delayed response of the health authorities could lead to endemisation.