1. International Livestock Research Institute (ILRI), P.O. Box 30709, GPO 00100, Nairobi, Kenya
2. The University of Nairobi, Faculty of Veterinary Medicine, P.O Box 29053 00625, Nairobi, Kenya
3. Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA
4. Land and Water, The Commonwealth Scientific and Industrial Research Organisation (CSIRO), Alice Springs, Australia
5. The Northern Institute, Charles Darwin University, Grevillea River, Alice Springs, Australia
6. Friedrich-Loeffler-Institut, Bundesforschungsinstitut für Tiergesundheit, Federal Research Institute for Animal Health, Südufer 10 , D-17493 Greifswald-Insel Riems, Germany