Angola declared the end of the world's worst yellow fever epidemic in a generation on Friday after a UN-backed vaccination campaign of 25 million people that resulted in no new cases in six months. The outbreak began a year ago in a slum in the capital, Luanda, before spreading throughout Angola, a war-scarred southeast African nation, and into neighboring Democratic Republic of Congo. In all, more than 400 people died. More than 15 million Angolans and 10 million Congolese were vaccinated under a campaign coordinated by the World Health Organization (WHO).