Yellow fever warning issued by WHO as outbreak grows in Angola
Angola epidemic has killed 258 people since December 2015.
At least 258 people have been killed and there have been around 1,975 suspected cases of the mosquito-borne disease since an epidemic erupted in December 2015. It has already grown to become the worst outbreak in decades.
Angola's outbreak has already spread to other countries in Africa, including the Democratic Republic of Congo (DRC), and at least 11 cases of yellow fever have been imported into China in people travelling from Angola.
"We are particularly concerned that large urban areas are at risk and we strongly urge all travellers to Angola to ensure they are vaccinated against yellow fever and carry a valid certificate."
It said three further cases have been reported in Uganda, but these patients had no history of travel to Angola.
Watch trade route to Uganda
Jack Woodall, a yellow fever expert who formerly worked for the WHO and the U.S. Centers of Disease Control and Prevention, said he is worried the outbreak could spread rapidly along a major trucking route from DRC to Uganda's capital Kampala.
A spokesman for the WHO in Geneva said a nationwide vaccination program that began in Angola in February has reached 7 million people.