6Rangel JM, Spading PH, Crowe C, et al. Epidemiology of Esche - richia coli O157 : H7 outbreaks, United States, 1982 - 2002[J] . Emerg In fect Dis, 2005, 11:603 -609.
7Soderstrom A, Lindberg A, Andersson Y, et al. EHEC O157outbreak in Sweden from locally produced lettuce, August-Sep-tember 2005 [ J]. Euro Surveill, 2005, 10 : E05092.
8Grant J, Wendelboe AM, Wendel A, et al. Spinach-associated outbreak, Utah and New Mexico, 2006 [JJ. Emerg Infect Dis, 2008, 14: 1633 - 1636.
9Muto T, Mat Y, Yamada M, et al . Outbreaks of entero-hemorrhagic Escherichia coli O157 infections among children with animal contact at a dairy farm in Yokohama City, Japan[J]. Jpn J Infect Dis, 2008, 61: 161 - 162.
10Verma A, Bolton FJ, Fiefield D, et al. An outbreak of E. coli O157 associated wit h a swimming pool: an unusual vehicle of transmission [J]. Epidemiol Infect, 2007,135:989 -992.
