Yellow Fever - Affected Countries

These are areas where the virus is present in monkeys and is a potential risk to humans.

Africa
Angola, Bolivia, Benin, Burkina Faso, Burundi, Cameroon, Central African republic, Chad, Congo, Ethiopia, Equatorial Guinea, Gabon, Gambia, Ghana, Guinea Bissau, Ivory Coast, Kenya, Liberia, Mali, Niger, Nigeria, Rwanda, SaoTome and Principe, Senegal, Sierra Leone, Somalia, Sudan, Tanzania, Togo, Uganda, Zaire, Zambia.

America
Boliva, Brazil, Colombia, Ecuador, French Guyane, Guyana, Panama, Peru, Suriname, Trindad and Tobago, Venezuela.

Some countries do not exactly follow these World Health Organisation guidelines. For example:
Belize is considered endemic by Costa Rica, Bangladesh, Egypt, Guinea Bissau, Guatemala and Guyana.
Honduras, Nicaragua and Equatorial Guinea are considered endemic by Ethiopia, Bangladesh, Egypt, Guinea-Bissau, Zambia and India.
Botswana is considered endemic by Malawi, Bangladesh and Egypt.
Mauritania is considered endemic by Bangladesh, Egypt and Guinea Bissau.
Djibouti is considered endemic by Mozambique and Guinea-Bissau.

Always check with your local yellow fever center before travelling.