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A Yemeni youth suspected of being infected with cholera receives treatment at a hospital in Sanaa on May 25, 2017. Cholera has killed 315 people in Yemen in under a month, the World Health Organization has said, as another aid organisation warned Monday the outbreak could become a 'full-blown epidemic'. / AFP PHOTO (Photo credit should read /AFP/Getty Images)

A Yemeni youth suspected of being infected with cholera receives treatment at a hospital in Sanaa on May 25, 2017.
Cholera has killed 315 people in Yemen in under a month, the World Health Organization has said, as another aid organisation warned Monday the outbreak could become a 'full-blown epidemic'.   / AFP PHOTO        (Photo credit should read /AFP/Getty Images)

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A Yemeni mother sits next to her child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017. Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO (Photo credit should read /AFP/Getty Images)

A Yemeni mother sits next to her child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017.
Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO        (Photo credit should read /AFP/Getty Images)

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An elderly Yemeni woman suspected of being infected with cholera receives treatment at a makeshift hospital in Sanaa on June 5, 2017. Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO (Photo credit should read /AFP/Getty Images)

An elderly Yemeni woman suspected of being infected with cholera receives treatment at a makeshift hospital in Sanaa on June 5, 2017.
Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO        (Photo credit should read /AFP/Getty Images)

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A Yemeni mother holds her child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017. Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO (Photo credit should read /AFP/Getty Images)

A Yemeni mother holds her child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017.
Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO        (Photo credit should read /AFP/Getty Images)

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A Yemeni doctor checks a child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017. Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO (Photo credit should read /AFP/Getty Images)

A Yemeni doctor checks a child suspected of being infected with cholera at a makeshift hospital in Sanaa on June 9, 2017.
Yemen is descending into total collapse, its people facing war, famine and a deadly outbreak of cholera, as the world watches, the UN aid chief said. / AFP PHOTO        (Photo credit should read /AFP/Getty Images)