Photo de stock - Yemenite men work in a sewage treatment plant in Sanaa, Yemen, 27 May 2017. According to the World Health Organisation (WHO) more than 30,000 people in the country devastated by civil war are sick with cholera. One reason for the epidemic is the lack of clean water for a majority of the population. Photo: Hani Al-Ansi/dpa. - Sanaa/Yemen

Photo de stock: Yemenite men work in a sewage treatment plant in Sanaa, Yemen, 27 May 2017. According to the World Health Organisation (WHO) more than 30.

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