1. Virginia Zoo, 3500 Granby St. Norfolk, Virginia 23504, USA
2. USGS National Wildlife Health Center, 6006 Schroeder Road, Madison, Wisconsin 53711, USA
3. University of Florida, Department of Infectious Diseases and Pathology, PO Box 110880, 2015 SW 16th Ave., Gainesville, Florida 32608, USA
4. Gladys Porter Zoo, 500 Ringgold St. Brownsville, Texas 78520, USA