1. Vaccine and Diagnostic Development Agricultural Research Council – Onderstepoort Veterinary Institute Pretoria South Africa
2. Department of Veterinary Tropical Diseases Faculty of Veterinary Science University of Pretoria Pretoria South Africa
3. Department of Production Animal Studies Faculty of Veterinary Science University of Pretoria Pretoria South Africa
4. College of Public Health, Medical and Veterinary Sciences James Cook University Townsville Queensland Australia