There is no yellow fever in Asia. Etiology Yellow fever is caused by a small RNA-containing Flavivirus. A few days to a week after being bitten, patients experience malaise, jaundice, fever, and leukopenia. A live, attenuated vaccine is available.
Side effects are rare, but encephalitis has been reported in infants.
For this reason, the vaccine is not recommended for children under the age of 6 months. 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.