1. National Reference Laboratory for Escherichia coli, Centre for Infectiology and Pathogen Characterization, Federal Institute for Risk Assessment (BfR), Diedersdorfer Weg 1, D-12277 Berlin, Germany
2. Tianjin Key Laboratory for Microbial Functional Genomics, TEDA College, Nankai University, 23 HongDa Street, TEDA, Tianjin 300457, P. R. China
3. TEDA School of Biological Sciences and Biotechnology, Nankai University, 23 HongDa Street, TEDA, Tianjin 300457, P. R. China
4. Robert Koch Institute, P13, Nordufer 20, D-13353 Berlin, Germany
5. Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, 05508-900, São Paulo, SP, Brazil