Cholera cases among cyclone survivors in Mozambique have jumped to 271, authorities said, a figure that nearly doubled from the previous day.
The Portuguese news agency Lusa cited national health director Ussein Isse, who declared the outbreak of the acute diarrheal disease on Wednesday with just five cases.
So far no cholera deaths have been confirmed, the report said. Another Lusa report said the death toll in central Mozambique from the cyclone that hit on March 14 had inched up to 501. Authorities have warned the toll is highly preliminary as flood waters recede and reveal more bodies.
The cholera cases have been discovered in the port city of Beira, whose half-million residents and especially those in crowded, poor neighbourhoods are at particular risk.
WATCH: Death toll from Cyclone Idai tops 750
Children and other patients curled up on bare beds at a treatment center in Beira on Saturday, some with anxious parents by their side. They had intravenous drips to help replace fluids.
Doctors Without Borders has said it is seeing some 200 likely cholera cases per day in the city, where relief workers are hurrying to restore the damaged water system and bring in additional medical assistance.
The World Health Organization has said some 900,000 cholera vaccine doses are expected to arrive on Monday, with a vaccination campaign starting later in the week.
Cholera is spread by contaminated food and water and can kill within hours if not treated. The disease is a major concern for the hundreds of thousands of cyclone survivors in the southern African nation now living in squalid conditions in camps, schools or damaged homes. Some drink from contaminated wells or filthy, stagnant water.
As health responders stress the need for better disease surveillance, the United Nations’ deputy humanitarian coordinator in Mozambique, Sebastian Rhodes Stampa, has said all cases of diarrhea are being treated as though they are cholera.
Cholera is endemic to the region, and “it breaks out fast and it travels extremely fast,” he told reporters on Friday.
WATCH: Crucial aid delivered to those displaced by cyclone in Mozambique
Doctors Without Borders has said other suspected cholera cases have been reported outside Beira in the badly hit areas of Buzi, Tica and Nhamathanda but the chance of spread in rural areas is smaller because people are more dispersed.
Mozambican officials have said Cyclone Idai destroyed more than 50 health centers in the region, complicating response efforts.
The cyclone also killed at least 259 people in Zimbabwe and 56 in Malawi.
The United Nations has said some 1.8 million people need urgent help across the sodden, largely rural region.
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