Abstract
1Institut für Mikrobiologie und Tierseuchen, Tierärztliche Hochschule Hannover, 30173 Hannover, Germany
6Botanisches Institut, Tierärztliche Hochschule Hannover, 30559 Hannover, Germany
7Gesellschaft für Biotechnologische Forschung mbH, 38124 Braunschweig, Germany
2Faculty of Veterinary Science, University of Zimbabwe, Harare, Zimbabwe
5Veterinary Research Laboratory, Harare, Zimbabwe
3Department of Pathobiology, University of Florida, Gainesville, Florida 32610-0006
4Department of Pathology and Division of Comparative Medicine, University of Florida, Gainesville, Florida 32610-0006