Dr Helen Rees, chair of SAGE, confirmed the findings: “Looking at really very good evidence, it was quite clear to SAGE that a single dose of yellow fever vaccine is effective. This is extremely important for countries where yellow fever is endemic: it will allow them to reconsider their vaccine scheduling. It is also important for travellers.” The recommendation by SAGE, while it may take some time for individual countries to adopt, could mean that travellers who can prove they have had at least one documented dose of the vaccine will no longer require a booster shot for travel to countries where yellow fever is an issue.
Some travellers, for example those who are pregnant, are not required to have a vaccine anyway, due to the increased risk of an adverse reaction. In such cases, travellers exempt from the requirement will need to carry with them a letter supplied by a licensed yellow fever clinic that explains why they do not need a vaccine.