The eye of the storm passed over Beira city in Mozambique before dawn on Saturday, having already brought heavy rains to Zambezia province and its capital, Quelimane.
UN Secretary-General Antonio Guterres called for a "generous response" from the international community to help Mozambiquans after Cyclone Kenneth and Idai, the worst environmental disasters ever experienced in Africa.
More than one million people are in need of emergency assistance in the aftermath of devastation wreaked by Cyclone Idai in Mozambique.
The cholera cases have been discovered in the port city of Beira, whose half-million residents and especially those in crowded, poor neighborhoods are at particular risk.
Cyclone Idai and floods in Mozambique, Zimbabwe and Malawai have killed at least 732 people and left thousands in desperate need of help, many on rooftops and trees.
The WFP has declared the flood crisis in Mozambique a level three emergency, putting it on a par with Yemen, Syria and South Sudan.
A swathe of southern Africa scrambled for survival following a powerful cyclone that killed hundreds of people in Mozambique, Zimbabwe, and Malawi, and displaced thousands of others.
Torrential rains were expected to continue into Thursday and floodwaters were still rising, according to aid groups trying to get food, water and clothing to desperate survivors.
Cyclone Idai could prove to be the deadliest storm in generations to hit the impoverished southeast African country of 30 million people.
At least 73 people have been confirmed dead in the accident near Mozambique's border with Malawi.
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