The outbreak was also taking on a "regional dimension," the UN Office for the Coordination of Humanitarian Affairs (OCHA) warned, pointing to reports from South Africa's health ministry of suspected cholera cases in Botswana.
"The cholera outbreak is not yet under control. Reported cases have reached 8,887, with 366 deaths as at 25 November. This is an increase of 1,604 cases and 53 more deaths from the previous day," said OCHA.
It said the higher death toll was due mainly to more fatalities reported from Beitbridge, which borders South Africa.
Over the weekend, South African and Zimbabwean health officials met to tackle the cholera outbreak which has also claimed lives in South Africa.
South Africa's health officials said the hospital in Musina, a South African town near the Zimbabwe border, has dealt with 168 patients, three of whom have died.