[1] USDA, APHIS, ANIM DIS DIAGNOST LAB, GREENPORT, NY 11944 USA
[2] NCI, VIRAL CARCINOGENESIS LAB, FREDERICK, MD 21702 USA
[3] GAME CONSERVANCY, UPLAND RES GRP, NEWTONMORE PH20 1BE, INVERNESS, SCOTLAND
[4] UNIV CALIF DAVIS, DIV ENVIRONM STUDIES, DAVIS, CA 95616 USA