1. Canadian Center for Vaccinology, Dalhousie University and the IWK Health Centre, Halifax, NS, Canada
2. Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
3. Department of Applied Oral Sciences, Faculty of Dentistry, Dalhousie University, Halifax, NS, Canada
4. Department of Pediatrics, Faculty of Medicine, Dalhousie University, Halifax, NS, Canada