1. Departments of Pathology1 and
2. the Moredun Research Institute, International Research Center, Penicuik, Midlothian, United Kingdom2; and
3. Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain3
4. National Jewish Medical and Research Center, University of Colorado Health Sciences Center, Denver,4 Colorado;
5. Microbiology,5 Colorado State University, Fort Collins, and