Health workers said the government was not doing enough to curb the epidemic, which has claimed almost 2,400 lives since February and at least 68 since 24 October.
Huila Province in the south and Uige Province in the north are the focus of concern. "Uige and Huila are getting quite out of control," said one source, who requested anonymity. "The provincial authorities in Uige aren't really doing anything to combat cholera."
Angola's infrastructure, including its health system, was ruined during a 27-year civil war that ended in 2002. Although it is sub-Saharan Africa's second-largest oil producer after Nigeria, and is undergoing an economic boom, most people live in dire poverty and the country still has one of the world's highest child mortality rates.
Observers say health infrastructure spending in Angola needs to be bolstered to provide clean water and sanitation supplies, essential to combating the cholera epidemic.
"Sanitary conditions continue to be precarious; they continue to be well below what we would hope for," said Jose Caetano, World Health Organisation spokesman in the capital, Luanda.
"But longer-term financing is necessary for there to be long-term development. Even with peace, you can't expect access to potable water to go from 30 [percent] to 90 percent in four years," he told IRIN.
Cholera is a waterborne intestinal infection that causes severe diarrhoea and vomiting, leading to rapid dehydration. Left untreated it can bring death within 24 hours but the World Health Organisation (WHO) describes it as "an easily treatable disease" cured with rehydration salts to replace lost fluids.
Despite this, and a series of measures put in place ahead of the annual rains from September to May, a total of 1,506 new cases have been reported across Angola since 24 October, with the exception of Huambo, Moxico and Lunda Sul provinces, which have reported no presence of cholera.
IRIN was unable to reach government officials for comment. Health workers are fearful that the number of people affected by the disease is likely to keep rising during the rainy season.
"Every day, more than 100 new cases are reported," said Erna Van Goor, general coordinator of medical relief agency Medecins Sans Frontieres-Holland in Luanda.
"Because the rains have really started in the provinces [outside Luanda Province], it is worse there," she added. "Luanda is lagging behind for now, but when the rains really start to come, cholera will increase here too."
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This article was produced by IRIN News while it was part of the United Nations Office for the Coordination of Humanitarian Affairs. Please send queries on copyright or liability to the UN. For more information: https://shop.un.org/rights-permissions