"In some parts of town there is raw sewage running down streets," BBC News website Harare diarist Esther says.
The spread of cholera has been aided by the collapse of Zimbabwe's health and sanitation systems amid a prolonged economic and political crisis.
Meanwhile, it has been confirmed that the Limpopo River, on Zimbabwe's border with South Africa, has been contaminated with cholera.
South African local health department spokesman Phuti Seloba has warned people not to use the river water at all.
Cases of cholera have been reported either side of Zimbabwe's borders with South Africa, Botswana and Mozambique.
The BBC's Peter Biles reports from the South African town of Musina, near the border with Zimbabwe, that cholera patients are being treated at an emergency centre on the lawn in front of the hospital.
One cholera victim from Harare told him that on Zimbabwe's side of the border, toilets had not functioned for a month, and people were "defecating everywhere".
Meanwhile Amnesty International said a human rights activist was abducted at dawn from her home in Norton, south of Harare, by a group of at least 12 armed plain-clothes men, who identified themselves as policemen.
The organisation challenged Zimbabwe's government immediately to disclose the whereabouts of Jestina Mukoko, who is the director of the Zimbabwe Peace Project.
The government has blamed its crisis on Western sanctions it says are aimed at trying to bring down President Robert Mugabe.
The health sector has been unable to cope with the cholera outbreak
But the sanctions imposed after allegations of electoral fraud and political violence are aimed at Mr Mugabe and his close associates and consist of travel bans and a freeze on their foreign assets.
Amid Zimbabwe's severe economic crisis, central bank governor Gideon Gono will lift import duty on basic goods, the state-run Herald newspaper reports.
"I believe this is the best Christmas present we can present to consumers this festive season," the Herald quotes him as saying.
The latest estimated annual inflation rate was 231,000,000%, and just one adult in 10 is thought to have a regular job.
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