Institution: | a Jack Brondum, DVM, MS, was with the Vermont Department of Health, Burlington, VT, U.S.A., at the time of this study b Kenneth C. Spitalny, MD, was affiliated with the Centers for Disease Control, Epidemiology Program Office, Division of Field Services, Atlanta, GA, U.S.A., and is now located at the New York City Department of Health c Julian A. Waller, MD, MPH, is on the faculty of the University of Vermont College of Medicine, Department of Medicine, Burlington, U.S.A. d Joy L. Herndon, MS, is with the Centers for Disease Control, Epidemiology Program Office, Division of Surveillance and Epidemiologie Studies, Atlanta, U.S.A. e Richard L. Vogt, MD, is with the Vermont Department of Health, 75 Davis Street, Providence, MI, U.S.A. |