Officials in Mozambique say the number of cholera cases among survivors of a devastating cyclone has jumped to 139.

The Portuguese news agency Lusa cites national health official Ussein Isse in a report late Thursday.

The cholera outbreak had been declared a day earlier with just five confirmed cases.

Community members assist a doctor carrying boxes with medical supplies as he runs towards the South African Defence Forces helicopter after assisting a community affected by a cyclone near Beira, Mozambique, Thursday, March 28, 2019. (AP Photo/Themba Hadebe)
Community members assist a doctor carrying boxes with medical supplies as he runs towards the South African Defence Forces helicopter after assisting a community affected by a cyclone near Beira, Mozambique, Thursday, March 28, 2019. (AP Photo/Themba Hadebe)

Cholera is a major concern for hundreds of thousands of survivors now living in squalid conditions. The disease is spread by contaminated food and water, causes acute diarrhea and can kill within hours if not treated with oral rehydration solution or intravenous fluids in severe cases.

The World Health Organization has warned of a “second disaster” if waterborne diseases like cholera spread in the devastated region. On Tuesday it said 900,000 oral cholera vaccines were on their way to the region.

A man pushes his bicycle past submerged huts near Beira, Mozambique, Thursday, March 28, 2019. The first cases of cholera have been confirmed in the cyclone-ravaged city of Beira, Mozambican authorities announced on Wednesday, raising the stakes in an already desperate fight to help hundreds of thousands of people sheltering in increasingly squalid conditions. (AP Photo/Themba Hadebe)
A man pushes his bicycle past submerged huts near Beira, Mozambique, Thursday, March 28, 2019. The first cases of cholera have been confirmed in the cyclone-ravaged city of Beira, Mozambican authorities announced on Wednesday, raising the stakes in an already desperate fight to help hundreds of thousands of people sheltering in increasingly squalid conditions. (AP Photo/Themba Hadebe)
Submerged huts near Beira, Mozambique, Thursday, March 28, 2019. The first cases of cholera have been confirmed in the cyclone-ravaged city of Beira, Mozambican authorities announced on Wednesday, raising the stakes in an already desperate fight to help hundreds of thousands of people sheltering in increasingly squalid conditions. (AP Photo/Themba Hadebe)
Submerged huts near Beira, Mozambique, Thursday, March 28, 2019. The first cases of cholera have been confirmed in the cyclone-ravaged city of Beira, Mozambican authorities announced on Wednesday, raising the stakes in an already desperate fight to help hundreds of thousands of people sheltering in increasingly squalid conditions. (AP Photo/Themba Hadebe)

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