Yellow Fever Vaccine
Yf-Vax is a live attenuated vaccine that provides immunization against yellow fever, a potentially fatal viral disease transmitted by infected mosquitoes. It is primarily recommended for individuals traveling to or residing in regions where yellow fever is endemic, as well as for those who may require proof of vaccination for entry into certain countries.
Yf-Vax is a yellow fever vaccine used to prevent a mosquito-borne viral disease in at-risk travelers and residents of endemic areas.
Key facts at a glance
- RxNorm
- 220976
- Generic
- Yf-Vax
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Yf-Vax is indicated for active immunization against yellow fever in individuals aged 9 months and older who are traveling to or living in areas where yellow fever is endemic, including parts of Africa and South America. It may also be required for travelers entering countries with yellow fever transmission risk.
Yf-Vax is a live attenuated vaccine containing a weakened strain of the yellow fever virus (17D-204 strain). After administration, the vaccine virus replicates and stimulates the immune system to produce antibodies and cell-mediated immune responses against the yellow fever virus, providing protection without causing the disease.
Yf-Vax is administered as a single subcutaneous injection. The vaccine provides long-lasting immunity, with a single dose generally considered to provide lifelong protection. It should not be given to individuals with severe allergies to vaccine components, immunocompromised patients, or pregnant women unless the risk of yellow fever outweighs potential risks. A valid yellow fever certificate may be required for international travel, and becomes effective 10 days after vaccination.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy