Fig. 3.

International air travellers arriving from yellow fever-endemic areas and aggregated population of yellow fever-suitable destination cities, by country or territory, 2016

SAR: Special Administrative Region.

Notes: Both axes have a logarithmic scale. A yellow fever-suitable city was ecologically suitable for yellow fever virus transmission but was not located in a yellow fever-endemic area, which was defined as an area where the World Health Organization recommended yellow fever vaccination. The symbols indicate the national yellow fever vaccination policy for travellers arriving in the country.