Results of surveillance for infections with Shiga toxin-producing Escherichia coli (STEC) of serotype O104:H4 after the large outbreak in Germany, July to December 2011 
Frank, C and Milde-Busch, A and Werber, D, Eurosurveillance, 19, 20760 (2014), https://doi.org/10.2807/1560-7917.ES2014.19.14.20760