1. Coxiella Pathogenesis Section, Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, USA
2. Vaccine and Infectious Disease Organization, Saskatoon, Saskatchewan, Canada
3. Research Technologies Branch, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, Hamilton, Montana, USA
4. Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, North Carolina, USA