1. Department of Oral Biology, University of Florida, Gainesville, Florida
2. Department of Microbiology and Immunology, New York Medical College, Valhalla, New York 10595
3. Western Dairy Center and Department of Nutrition and Food Sciences, Utah State University, Logan, Utah
4. Laboratoire de Microbiologie et Génétique Moléculaires, UMR 5100 CNRS-Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 9, France