WHO launches yellow fever vaccine campaign in DRCongo, Angola The World Health Organization (WHO) says it will help Angola and the Democratic Republic of Congo launch a mass vaccination campaign against a yellow fever outbreak ravaging the two countries.The campaign will aim to immunise 15.5 million people in the two countries by the end of August, Bruce Aylward, the WHO's chief on outbreaks and health emergencies, told reporters, describing it as "an unprecedented push." IMAGES AND SOUNDBITES of vaccinations in Kinshasa.