Objective To study the molecular epidemiology of two Salmonella enteritidis strains in two food-poisoning accidents occurred at the same time but separated in a distance of 210 kilometers away from each other.Methods Eight S.enteritidis stains isolated from patients and food residues in two food-poisoning accidents were identified,and single colonies were picked out to multiply on agar plates.The total DNA of isolates was digested with restriction enzyme Xba I,and run pulsed-field gel electropho...