Yellow fever is still endemic in 44 tropical countries in Africa and the Americas. As a frequent traveller to many of these regions, I was vaccinated against Yellow Fever a little over 10 years ago and was considering re-vaccination when I read the new guidance from the WHO about Yellow Fever re-vaccination.

The Yellow Fever vaccine has been given since 1930 (about 600 million doses) and there have only been 12 reported cases of infection post vaccination which has lead the WHO Strategic Advisory Group of Experts on immunization to declare re-vaccination not required. 

Dr Helen Rees said:

“Looking at really very good evidence, it was quite clear to SAGE that in fact a single dose of yellow fever vaccine is effective."

Who press release here.