1. Departments of Entomology,1
2. Max von Pettenkofer Institut,2 Universität München, Munich, Germany
3. Rocky Mountain Laboratory, National Institutes of Health, Hamilton, Montana,3 and
4. Division of Infectious Diseases, Department of Medicine,4 and
5. Plant Pathology,5 and
6. Veterinary Diagnostic Laboratories,6 University of Minnesota, St. Paul, Minnesota,
7. Clinical and Population Sciences7 and