high-risk Yellow Fever country Travelers' Health Website: Yellow Fever high-risk Yellow Fever country CDC Travelers Health: Yellow Fever Travelers' Health: Yellow Fever Countries with risk of yellow fever virus (YFV) transmission Travelers' Health: Yellow Fever Travelers' Health: Yellow Fever Yellow Fever Disease and Vaccine Information on this website traveler's health website CDC Travelers' Health page on this website Travelers' Health: Yellow Fever on this website CDC Travelers' Health page CDC Travelers' Health page