Mozambique's Land and Environment Minister Celso Correia told journalists that the death toll had risen to 446 from 417, adding that 531,000 people had been affected by the disaster and 110,000 were in camps.
The storm has also killed scores of people in Zimbabwe, with the United Nations' migration agency reporting that 259 people had been killed while its humanitarian arm OCHA said the death toll was at 154.
Reuters could not immediately contact authorities in Zimbabwe.
In Malawi, 56 people died in heavy rains ahead of the cyclone.
In all three countries, survivors have been digging through rubble to search for victims, and scrambling for shelter, food and water, while governments and aid agencies rush in help.
The Mozambican minister had said on Saturday that some 1,500 people were in need of immediate rescue from rooftops and trees. On Sunday he said the number of people who needed rescuing had came down dramatically, without giving a figure.
The floods have raised the risk of cholera and other water-borne diseases, and Correia said the government was opening a cholera treatment centre in readiness of an outbreak.
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