1. SAMRC Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice, South Africa
2. Applied and Environmental Microbiology Research Group (AEMREG), Department of Biochemistry and Microbiology, University of Fort Hare, Alice, South Africa
3. Department of Plant and Soil Sciences, University of Pretoria, Hatfield, South Africa
4. Department of Science and Technology-National Research Foundation Centre of Excellence in Food Security, Pretoria, South Africa