Notice: The Blue Sheet was discontinued after March 1, 2004

The Centers for Disease Control and Prevention’s (CDC) recommendations for yellow fever vaccination were broadened this year to include all areas where there is a risk for yellow fever virus transmission. New recommendations do not make a distinction between “yellow fever-infected areas” and “yellow fever-endemic zones.” Yellow fever-infected areas, by World Health Organization criteria, are areas reporting yellow fever cases. CDC defines yellow fever-endemic zones as areas reporting cases but also includes areas where a competent vector, nonhuman primates, and the ecological conditions for yellow fever virus transmission exist. Because there is a potential for infection for travelers to either endemic or infected zones, the best protection is to be vaccinated when visiting such areas.

The list of yellow fever-infected areas on the Blue Sheet does not reflect this new interpretation of disease risk; therefore, the Blue Sheet was discontinued as of March 1, 2004.

The most current information on CDC yellow fever vaccination recommendations by country can be found at this website: http://www.cdc.gov/travel/yb/outline.htm#2.