1. a eThekwini Municipality Health Department, 9 Archie Gumede Place, Durban 4001, South Africa
2. b School of Life Sciences, University of KwaZulu-Natal, KwaZulu-Natal, Durban 4001, South Africa
3. c WASH Research and Development Centre, University of KwaZulu-Natal, KwaZulu-Natal, Durban 4001, South Africa
4. d Institute for Water and Wastewater Technology, Durban University of Technology, KwaZulu-Natal, Durban 4001, South Africa