1. Division of Veterinary Medicine, Tulane National Primate Research Center, Covington, Louisiana, USA. jdufour@tulane.edu
2. Division of Veterinary Medicine, Tulane National Primate Research Center, Covington, Louisiana, USA
3. Division of Comparative Pathology, Tulane National Primate Research Center, Covington, Louisiana, USA
4. Division of Microbiology, Tulane National Primate Research Center, Covington, Louisiana, USA
5. Division of Immunology, Tulane National Primate Research Center, Covington, Louisiana, USA
6. Department of Biology, Boston College, Chestnut Hill, Massachusetts, USA