1. From the Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Robbins, Rowell, Borden); Hyla Ecological Services, 65 Arrowhead Rd, Concord, MA 01742 (Windmiller); Viral and Rickettsial Zoonoses Branch, Division of Viral and Rickettsial Diseases, Centers for Disease Control and Prevention, United States Department of Health and Human Services, 1600 Clifton Rd NE, Mailstop G-33, Atlanta, GA 30333 (Niezgoda...