Table 1. International air travellers arriving in cities where yellow fever was endemic from other endemic areas or cities, 2016.

Destination country or territory,a by rankb	No. travellers arriving from yellow fever-endemic areas		Urban population of destination country, millionsc	Proof of yellow fever vaccination required upon arrival
	Departure airport within 200 km of a yellow fever-endemic area (base scenario)d	Departure airport within 200 km of a city in a yellow fever-endemic area (urban scenario)e		From yellow fever-endemic countries only	From any country
1. Colombia	1 373 439	776 317	16.4	Yes	No
2. Panama	995 941	625 764	1.7	Yes	No
3. Brazil	769 203	474 260	54.6	Nof	Nof
4. Nigeria	532 602	485 319	46.8	Yes	No
5. Ghana	389 242	378 893	6.1	No	Yes
6. Côte d'Ivoire	360 179	347 372	6.0	No	Yes
7. Kenya	357 561	291 022	5.7	Yes	No
8. Senegal	322 374	295 805	3.5	Yes	No
9. Cameroon	280 895	272 308	7.5	Yes	No
10. Venezuela (Bolivarian Republic of)	221 837	185 895	7.3	Yes	No
11. Gabon	199 560	197 595	0.7	No	Yes
12. Congo	195 571	178 963	2.9	No	Yes
13. Benin	189 191	186 575	1.4	Yes	No
14. Mali	161 064	151 877	2.5	No	Yes
15. Paraguay	151 425	112 640	2.8	Yes	No
16. Uganda	149 683	135 482	1.9	Yes	No
17. Angola	125 518	92 021	7.2	No	Yes
18. Bolivia (Plurinational State of)	121 798	93 353	2.1	Yes	No
19. Democratic Republic of the Congo	118 798	80 433	20.1	No	Yes
20. Burkina Faso	105 837	97 019	3.5	Yes	No
21. Togo	104 851	102 487	1.0	No	Yes
22. South Sudan	92 280	83 838	0.3	No	No
23. Sudan	90 271	48 908	2.1	Yes	No
24. Guinea	75 603	73 078	1.9	Yes	No
25. Liberia	65 060	64 915	1.3	No	Yes
Other countriesg	315 213	284 692	7.4	NA	NA
Total	7 864 996	6 116 831	214.7	NA	NA

NA: not applicable.

^a All destination countries and territories were yellow fever-endemic areas.

^b Countries and territories were ranked according to the number of travellers arriving from yellow fever-endemic areas, which was determined by examining all outbound international flights from airports within areas where the World Health Organization (WHO) recommended yellow fever vaccination and all airports within 200 km of such areas.^17–19

^c Nationally aggregated population living in cities.

^d The base scenario considered international travellers arriving from airports within areas where WHO recommended yellow fever vaccination and all airports within 200 km of such areas.

^e The urban scenario considered international travellers arriving from airports within 200 km of a city (population ≥ 300 000) in an area where WHO recommended yellow fever vaccination.

^f We did not take into account Brazil’s temporary yellow fever vaccination requirements for incoming passengers from Angola and the Democratic Republic of the Congo during the 2016 outbreak.

^g There were 10 other yellow fever-endemic destination countries with an airport within 200 km of a yellow fever-endemic city with a population of at least 300 000: Argentina, Burundi, Central African Republic, Chad, Ethiopia, Gambia, Guinea-Bissau, Niger, Peru and Sierra Leone. We did not show the 7 countries where there was no city with at least 300 000 residents located in a yellow fever-endemic area: Ecuador, Equatorial Guinea, French Guiana, Guyana, Mauritania, Suriname and Trinidad and Tobago.