Travellers to areas where yellow fever is present are at risk of contracting the disease if they are not vaccinated. The risk of yellow fever varies depending on the location, time of year, and activities of the traveler, and duration of the stay. Generally, the risk of yellow fever is highest in rural areas and during the rainy season, when mosquito populations are at their highest.
While there is no accurate data, according to Centre for Disease Control and Prevention, for a 2-week stay, the estimated risks for illness and for death due to YF for an unvaccinated traveler visiting an endemic area are as follows:
- In West Africa, 50 per 100,000 and 10 per 100,000, respectively
- In South America, 5 per 100,000 and 1 per 100,000, respectively
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