Angola’s Deputy Health Minister Jose Van Dunem said the government has managed to contain infections to the northern Uige province, with no new cases reported in other areas.
Poor roads out of the town of the same name have apparently helped keep the Ebola-like disease in check.
While people outside the province have fallen ill with the virus, the government said they had all visited Uige.
Officials have confirmed 235 deaths since the epidemic began in October, most of them children.
Another 22 people are infected.
It is the world’s worst outbreak since 123 people died in the Democratic Republic of Congo between 1998 and 2000.
A statement from Angola’s health ministry and the World Health Organisation (WHO) said an additional 513 people are under surveillance.
“We don’t think that it is over,” David Daigle of the WHO said of the haemorrhagic fever.
“The numbers are still going up.”
A team of top virologists, epidemiologists and anthropologists from the WHO and Medecins sans Frontieres arrived in Uige last month.
The paediatric ward of the local hospital has been identified as the likely source of the initial outbreak.
Mr Daigle said efforts to assess Marburg’s spread and warn villagers had been hampered by residents shunning health workers and hospitals.
He said local musicians and anthropologists had worked on recording a Marburg prevention song, now being broadcast on the radio and truck-mounted loudspeakers, to overcome the problem.
Marburg can kill a healthy person in a week, inducing vomiting and diarrhoea, followed by severed fever.
The disease is spread through contact with bodily fluids, such as sweat, saliva and blood.
It is not treatable with any known drugs.