World Health Organization spokeswoman Aphaluck Bhatiasevi said the workers will begin vaccinating in Benin, Liberia and Sierra Leone on Monday. She says local health teams also will offer vitamin A and deworming tablets and, in Sierra Leone, the measles vaccine.
There are an estimated 200,000 cases of yellow fever worldwide each year, causing 30,000 deaths, according to WHO.
The mosquito-borne virus is endemic in Africa, and there is no known cure. The 30-year vaccine is effective for 99 percent of people.
WHO says some 29 million people have been vaccinated in West Africa since 2007.
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