1. Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa.
2. Stephen A. Wynn Institute for Vision Research, University of Iowa, Iowa City, Iowa.
3. Department of Ophthalmology and Visual Sciences, Carver College of Medicine, University of Iowa, Iowa City, Iowa.
4. Iowa Lions Eye Bank, Coralville, Iowa.
5. Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas.
6. Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, Texas.
7. Department of Pathology, University of Texas Medical Branch, Galveston, Texas.
8. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa.