1. Guelph Research and Development Centre, Agriculture and Agri-Food Canada, Guelph, Ontario, Canada
2. Department of Molecular and Cellular Biology, College of Biological Science, University of Guelph, Guelph, Ontario, Canada
3. Kentville Research and Development Centre, Agriculture and Agri-Food Canada, Kentville, Nova Scotia, Canada
4. Gay Lea Foods Co-operative, Research and Development Centre, Hamilton, Ontario, Canada
5. Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada