Five cases have been confirmed in the badly damaged port city of Beira, according to health officials.

Mozambique said five cases of cholera had been confirmed around the badly damaged port city of Beira, after a powerful cyclone killed more than 700 people across a swath of Southern Africa.

Cyclone Idai smashed into Mozambique at around midnight on March 14 before tearing through neighbouring Zimbabwe and Malawi, displacing hundreds of thousands of people and wrecking an area of 3,000sq km.

The relief focus has increasingly turned to preventing or containing what many believe will be inevitable outbreaks of diseases like malaria and cholera.

“We did the lab tests and can confirm that these five people tested positive for cholera,” Ussein Isse, a senior Mozambican health official, told reporters on Wednesday.

“It will spread. When you have one case, you have to expect more cases in the community,” Isse added.

Health workers were also battling 2,700 cases of acute watery diarrhoea – which could be a symptom of cholera – Isse said, adding that the government had organised a treatment centre for cholera in Beira hospital.

The World Health Organization is dispatching 900,000 doses of the oral cholera vaccine to affected areas from a global stockpile. The shipment is expected to be sent later this week.

The death toll in Mozambique from Cyclone Idai has risen to 468, a Mozambican disaster management official said. That takes the total number of deaths in Mozambique, Zimbabwe and Malawi to above 700 people, with many more missing.