James L. Hardy is Professor of Medical Virology, Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA 94720; Edward J. Houk is Assistant Research Entomologist, Naval Biosciences Laboratory, School of Public Health, University of California, Berkeley, CA 94720; Laura D. Kramer is Post-doctoral Fellow, Naval Biosciences Laboratory, School of Public Health, University of California, Berkeley, CA 94720; Richard P. Meyer is Post-doctoral Fellow at the Arbovirus Field Station, School of Public Health, Bakersfield, CA.