Definition: The Yellow Fever vaccine is a live attenuated virus, which means it contains only the weakened or inactive form of the yellow fever virus in the body's immune system. Definition: A yellow fever vaccine is a type of vaccination that is used to prevent yellow fever, which is caused by a virus called Yellow fever. The vaccine contains small pieces of the virus that are designed to stimulate the immune system and produce antibodies against the virus. This makes you less likely to get yellow fever. The Yellow Fever Vaccine is administered through injection or oral drops. It can take several weeks for your body to develop immunity to the virus, so be patient and follow the instructions carefully. It's important to note that getting a Yellow Fever vaccine does not protect you from getting yellow fever or any other illness caused by the yellow fever virus. If you are traveling outside of your home country with yellow fever risk factors (such as high-risk blood group or compromised immune system), it is recommended to consider getting a Yellow Fever vaccine to protect yourself and others.