Yellow fever vaccination

Yellow fever vaccination is an immunization that protects against a serious virus transmitted by mosquitoes, mainly in parts of Africa and South America. The vaccine contains a weakened form of the virus, prompting your immune system to recognize and fight it if exposed later. Usually given as a single shot, it offers long-lasting immunity—often for life. The vaccination is crucial for travelers to affected regions and is sometimes required for entry. It is safe for most people but should be avoided if you have certain medical conditions or allergies. Overall, it’s an effective way to prevent a potentially life-threatening disease.