1. Laboratory of Food Microbiology, Wageningen University and Research Centre, Bomenweg 2, 6703 HD Wageningen, The Netherlands
2. Wageningen Centre for Food Sciences (WCFS), Diedenweg 20, 6703 GW Wageningen, The Netherlands
3. Division of Health and Safety, NIZO Food Research, Kernhemseweg 2, 6718 ZB Ede, The Netherlands
4. Institute of Medical Microbiology, Justus-Liebig University, Frankfurter Strasse 107, 35392 Giessen, Germany