Yellow fever vaccination should be avoided when a person has a condition that might increase the risk for a serious adverse reaction, or a condition that might compromise the ability of the vaccine to produce immunity. Vaccination can be considered in these situations if travel to an endemic area is unavoidable and the benefits of vaccination outweigh the risks. Note that the ACIP considers moderate to severe illness, with or without fever, as a precaution to administration of all vaccines.
Precautions to yellow fever vaccine administration are
Asymptomatic HIV infection with moderately decreased CD4+ counts
Adults aged 60 years and older
Infants aged 6–8 months
For specific guidance in these situations, follow the recommendations of the ACIP, or contact your state health department. Vaccination recommendations also are available at 1-800-CDC-INFO.