1 Department of Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada Department of Biological Sciences, Thompson Rivers University, Kamloops, British Columbia, Canada.
2 Department of Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada.
3 Department of Biological Sciences, Thompson Rivers University, Kamloops, British Columbia, Canada.
4 Department of Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada wmohn@mail.ubc.ca.