Amid rising concern over a deadly outbreak of yellow fever spreading from Angola, the World Health Organization on Tuesday urged travelers to the African country to heed its warnings and get vaccinated. 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. Yellow fever is transmitted by the same mosquitoes that spread the Zika and dengue viruses, although it is a far more serious disease with death rates as high as 75 percent in severe cases requiring admission to hospital. FULL REPORT