Untreated wastewater is responsible for the deaths of 800 children under five every day, and inflicts serious damage to the environment. Knowing where sewage ends up is vital.
Water at informal settlements, where sanitation and waste management facilities were absent, had high bacteria levels.
Shared toilets have been shown to be linked to poor health outcomes.
When day zero arrives in Cape Town, the routine surveillance systems that monitor disease outbreaks will be enhanced to pick up new diseases.