Stamaril is a live attenuated viral vaccine designed to protect against yellow fever, a potentially fatal disease transmitted by mosquitoes. It is used in individuals traveling to, or living in, areas where yellow fever is known to be present, as well as for people who might be exposed to the virus due to their work. The vaccine works by stimulating the body's immune system to produce antibodies against the yellow fever virus, thereby providing immunity to the disease. Stamaril is administered as a single injection and is known for its long-lasting protection, often requiring only a booster dose after 10 years for continued immunity. It is recommended for people over the age of 9 months, with certain precautions advised for specific groups such as pregnant women and individuals with weakened immune systems.