Materials and method: A prospective cohort study was conducted using PPS sampling. Data of food poisoning cases among 4, 593 people from 1, 170 households and 595 treatment facilities (86 hospitals, 190 polyclinics and 319 commune health centers) were collected for 2 weeks from 20.03.2013 to 31.03.2013 in the city of Ho Chi Minh.