1. Public Health Ontario, Toronto, Ontario, Canada
2. Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
3. Department of Pathology & Immunology, Washington University in St. Louis, St. Louis, Missouri, USA
4. Division of Infectious Diseases, Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
5. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada