1. Bacterial Diseases Branch, Division of Vector‐Borne Diseases, National Center for Enteric, Zoonotic, and Infectious Diseases Centers for Disease Control and Prevention Fort Collins CO 80521 U.S.A.
2. Plague Program Uganda Virus Research Institute Entebbe Uganda
3. National Wildlife Research Center, United States Department of Agriculture, Animal and Plant Health Inspection Service Wildlife Services Fort Collins CO U.S.A.