At least 50 people killed and 241 infected in the first outbreak of the disease in the country in 30 years.
A total of 241 people were now infected, the southern African country's national director of public health, Adelaide de Carvalho, said. More than 450,000 people had been vaccinated in the capital of a target of nearly 1.6 million, Carvalho added.
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There is no specific treatment for the viral haemorrhagic disease which is transmitted by infected mosquitoes and found in tropical regions of Africa and Latin America's Amazon region.
Yellow fever symptoms include severe headache, nausea, vomiting and fatigue, according to the World Health Organization.
The disease can enter a toxic phase in some people, leading to organ failure and death.
Poor sanitation is being blamed for stoking the outbreak, by providing fertile breeding grounds for mosquitos.
Angola lies in the yellow fever belt of Africa where vaccination against the disease is recommended.
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