Affiliation: | 1.Jiangsu Provincial Center for Disease Control and Prevention, 172 Jiangsu Road, Nanjing, 210009, Jiangsu, China ;2.National Health Committee Key Laboratory of Enteric Pathogenic Microbiology, 172 Jiangsu Road, Nanjing, 210009, China ;3.National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, 100021, China ; |