1. University of Pretoria, Pretoria, South Africa;
2. Allerton Veterinary Laboratory, Pietermaritzburg, South Africa;
3. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
4. Onderstepoort Veterinary Research Institute, Pretoria, South Africa;
5. Natural Science Museum, Durban, South Africa;
6. Canadian Food Inspection Agency, Nepean, Ontario, Canada