has role immunizes against disease immunizes recipient immunizes against pathogen yellow fever Yellow fever virus Homo sapiens yellow fever virus vaccine live attenuated viral vaccine YF-17DD vaccine Randi Vita A Yellow fever virus vaccine that uses the live attenated 17DD strain. Oliver He https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3903908/ Two distinct strains of live attenuated yellow fever virus vaccine, 17D and 17DD, have been widely used. They have the same origin, from a yellow fever virus isolated from a patient with non fatal yellow fever named Asibi, from Ghana, in 1927. The 17D strain, used for vaccine production, corresponds to passage level 235-240 and the 17DD to a passage level 286-287. The comparison of the nucleotide sequences of all 17D vaccines showed an overall homology of 99.2%. vaccine live attenuated vaccine role