Like clockwork, diarrhea among children spikes sharply during Cape Town’s long summer. The city tends to blame the heat and people’s poor hygiene practices, but its own sewage infrastructure may be the real culprit.

In this edition of Super Friday, we are in Cape Town, South Africa, where Steve Kretzmann goes beyond the headlines to dig into what might be the real causes of the spikes in diarrhoea in that country. This investigation was produced in collaboration with the Center for Collaborative Investigative Journalism.

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