How do vaccines help prevent yellow fever outbreaks?

Yellow fever is a viral disease transmitted by infected mosquitoes and can cause fever, bleeding, and liver damage. The vaccine is a live attenuated vaccine that produces strong, long-lasting immunity in most recipients. It has been used for decades in endemic regions of Africa and South America, and some countries require proof of vaccination for entry. Because outbreaks can spread quickly where mosquitoes are present, vaccination is one of the most effective tools for prevention. Public health responses often combine vaccination with mosquito control and surveillance.