1. Food Microbial Sciences Unit, School of Food Biosciences, University of Reading, Reading RG6 6AP, UK
2. Waltham Centre for Pet Nutrition, Waltham-on-Wolds, Melton Mowbray LE14 4RT, UK
3. Culture Collection, Department of Clinical Microbiology, University of Göteborg, SE-413 46 Göteborg, Sweden