Preferably, vaccination should be deferred until the child is 9 months to one year old. The vaccine is grown in eggs and is contraindicated in persons with allergies to eggs. Proof of vaccination is afforded by an International Certificate of Vaccination stamped by an official vaccinating center. In the United States, the Centers for Disease Control and Prevention is responsible for licensing official vaccination centers. Immunity is probably life-long, but the official vaccination certificate is only good for 10 years.
Vaccination is recommended for travelers to countries with infected mosquito populations.
Some countries require vaccination before they will permit travelers to enter. Travelers who pass through these countries may be required to provide proof of immunity to subsequent countries on their itinerary. In its annual Health Information for International Travel, the Centers for Disease Control and Prevention publishes country-specific information on yellow fever vaccination requirements and recommendations. All Rights Reserved.