1. Lehrstuhl für Mikrobielle Ökologie, Department für Grundlagen der Biowissenschaften, Technische Universität München, Weihenstephaner Berg 3, D-85354 Freising, Germany
2. Swedish Dairy Association, Scheelevaegen 18, 223 63 Lund, Sweden
3. Institut National de la Recherche Agronomique, UMR A408 Sécurité et Qualité des Produits d'Origine Végétale, INRA, Domaine Saint-Paul, Site Agroparc, F-84914 Avignon Cedex 9, France
4. Department of Pharmacology, Microbiology and Food Hygiene, The Norwegian School of Veterinary Science, Ullevalsveien 72, PO Box 8146, Dep., N-0033 Oslo, Norway
5. Dept for Applied Chemistry and Microbiology, College of Agriculture and Forestry at the University of Helsinki, Biocenter PO Box 56, Viikinkaari 9, FIN 00014 Helsinki University, Finland
6. Institute of Hygiene and Technology of Food of Animal Origin, Ludwig-Maximilians-Universität München, Veterinaerstr 13, D-80539 Munich, Germany