Yellow Fever Virus is a mosquito-borne virus that causes yellow fever, a serious disease affecting humans and some primates. It is primarily transmitted by the Aedes and Haemagogus mosquito species. Symptoms can range from mild fever and chills to severe liver damage, leading to jaundice and bleeding. Vaccination is the most effective way to prevent yellow fever. The yellow fever vaccine provides long-lasting immunity and is recommended for travelers to areas where the virus is endemic. Early diagnosis and supportive care are crucial for managing severe cases of the disease.