M.N. Bester, J.P. Bloomer, R.J. van Aarde, B.H. Erasmus, P.J.J. van Rensburg, J.D. Skinner, P.G. Howell & T.W. Naude Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria, 0002 South Africa Department of Infectious Diseases, Faculty of Veterinary Sciences, University of Pretoria, Onderstepoort, 0110 South Africa Department of Pharmacology and Toxicolo...