1. Wildlife Conservation Society, Zoological Health Program, Bronx Zoo, 2300 Southern Blvd., Bronx, New York 10460, USA
2. Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Minnesota, 1333 Gortner Ave., St. Paul, Minnesota 55108, USA
3. New Jersey Department of Environmental Protection Fish and Wildlife, Endangered and Nongame Species Program, PO Box 394, Lebanon, New Jersey 08833, USA