1. Department of Biochemistry and Microbiology, University of Zululand, KwaDlangezwa, South Africa.
2. Bacteriology Section, Agricultural Research Council–Onderstepoort Veterinary Research, Onderstepoort, South Africa.
3. Agricultural Research Council—Biometry Unit, Onderstepoort, South Africa.
4. Agriculture and Life Sciences, University of South Africa, Florida, South Africa.
5. Directorate of Veterinary Public Health, Department of Agriculture, Land Reform and Rural Development, Pretoria, South Africa.