Rift valley fever virus infected rhesus as a model for drug evaluation: Comparison of prophylaxis with rivavirin or placebo : J.W. Huggins1, J.C. Morrill2, Z.X. Zhang1, O.M. Brand1, M.J. Topper3, J.I. Smith4, C.R. Bartz1, 1Department of Antiviral Studies, Virology Division, 2Disease Assessment Division, 3Pathology Division, 4Medical Division, U.S. Army Medical Research Institute of Infections Diseases, Ft. Detrick, MD, USA