William P. Yonushonis,¹ Michael R. Elwell,² Phillip G. Lawyer,³ Ernst C. Rabago<sup>4

1</sup>Division of Veterinary Medicine, Walter Reed Army Institute of Research, Washington, D.C. 20307, USA
²National Institute of Environmental Health Sciences, Chemical Pathology Branch, Research Triangle Park, North Carolina 27709, USA
³Department of Entomology, Division of Communicable Disease and Immunology, Walter Reed Army Institute of Research, Washington, D.C. 20307, USA
⁴Veterinary Services, Gorgas Army Hospital, APO Miami 34004, USA