Mozambique’s cyclone-hit city of Beira has confirmed its first death from cholera, as the number of cases of the disease has jumped to 517.

To control the outbreak emergency clinics have been set up across Beira, a city of 500,000, said Mozambican national health director Ussene Isse, according to broadcaster TVM.

Cases of the acute diarrhoeal disease have risen dramatically since the first five cases were confirmed last Wednesday. Cyclone Idai severely damaged the water system for Beira, a city of 500,000, when it hit on 14 March.

Some 900,000 cholera vaccine doses are set to arrive today, according to the World Health Organisation.

Cholera is spread by contaminated water and food. It can kill within hours but is relatively easy to treat.

Mozambique cyclone Idai Show all 28 1 /28 Mozambique cyclone Idai Mozambique cyclone Idai A young boy makes fire as he plays in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Displaced families arrive after being rescued by boat from a flooded area of Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Children wait as their parents disembark from a boat after being rescued from a flooded area of Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A displaced family arrives after being rescued by a boat from a flooded area of Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A man docks a boat carrying displaced families after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai An elderly woman is assisted disembark from a boat after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Two men rescue an animal using a boat in Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP (AP Photo/Themba Hadebe) Mozambique cyclone Idai A man holding his child watches a boat carrying displaced familie arrive after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP (AP Photo/Themba Hadebe) Mozambique cyclone Idai A woman walks along a flooded road in Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Relatives and friends watch as the boat arrives from Buzi disembark from a boat after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A young girl is carried off the boat after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A young girl is carried off the boat after being rescued from a flooded area of Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A woman walks along a flooded road in Buzi district, 200km outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A displaced family arrives after being rescued by a boat from a flooded area of Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun of efforts to find and help tens of thousands of people after Cyclone Idai devastated a large swath of Mozambique. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Veronica Fatia carries her 2-year-old daughter as they travel in a wooden boat to Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. They left the cyclone-shattered city of Beira for the town of Buzi, which for a week people had been fleeing to with little but their clothes. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A fisherman navigates a wooden boat to Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Children stand in-front of a business building in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Veronica Fatia carries her 2-year-old daughter as they travel in a wooden boat to Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. They left the cyclone-shattered city of Beira for the town of Buzi, which for a week people had been fleeing to with little but their clothes. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A displaced young boy sleeps on the floor at a school in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. People left the cyclone-shattered city of Beira for the town of Buzi, which for a week people had been fleeing to with little but their clothes. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A young boy walks through a muddy walkway in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Passengers of a wooden boat travel to Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Displaced families rest inside a damaged classroom in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai Relatives and friends watch as a boat arrives with people rescued from flooded areas to Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A group of men watch the arrival of a boat carrying displaced families rescued from a flooded area of Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai A young boy sits outside their flooded house in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe) Mozambique cyclone Idai An aerial photo shows a damaged factory following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. AP Mozambique cyclone Idai An aerial photo shows local residents walk on a damaged road following the devastating Tropical Cyclone Idai in Beira, Mozambique, Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. ( AP Mozambique cyclone Idai Displaced families set up their bedding on top of the roof in Buzi district, 200 kilometers (120 miles) outside Beira, Mozambique, on Saturday, March 23, 2019. A second week has begun with efforts to find and help some tens of thousands of people in devastated parts of southern Africa, with some hundreds dead and an unknown number of people still missing. (AP Photo/Themba Hadebe)

The overall cyclone death toll in Mozambique is now 518. With 259 deaths in Zimbabwe and 56 in Malawi, the three-nation death toll is more than 815. Authorities warn the tolls are preliminary as flood waters recede and reveal more bodies.

The Chinese government has sent doctors and emergency workers to fight the cholera outbreak in Beira and Chinese aid workers sprayed anti-cholera disinfectant in parts of the port city.

The US military joined the international humanitarian aid efforts to Mozambique by airlifting food and relief supplies from South Africa.

Round-the-clock flights are delivering supplies from the UN World Food Programme (WFP) from King Shaka International Airport in Durban, South Africa, said Robert Mearkle, US embassy spokesman.

He said the commodities airlifted from Durban were from the WFP’s internal stock.

“Separately from these shipments, the US has provided nearly $3.4 million in additional funding for the WFP to deliver approximately 2,500 metric tons of rice, peas, and vegetable oil to affected people in Sofala, Zambezia, and Manica provinces,” said Mr Mearkle.

“This lifesaving emergency food assistance will support approximately 160,000 people for one month.”

Beira’s crowded, poor neighbourhoods are especially at risk. 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.

Cholera 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 diarrhoea 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.

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 centres in the region, complicating response efforts.

The United Nations has said some 1.8 million people need urgent help across the sodden, largely rural region.