1. ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah.
2. Neurovirology Research Laboratory and the Department of Neurology, University of Utah School of Medicine, Salt Lake City, Utah.
3. Department of Neurology, University of Utah School of Medicine, Salt Lake City, Utah.
4. Departments of Pathology, Pediatrics and Medicine, University of Utah School of Medicine, Salt Lake City, Utah.