Yellow Fever
Yellow fever is caused by a virus and is transmitted from person to person by the bite of an infected mosquito. Rural populations, especially those in or near forests, face the greatest risk, because these areas are home to the mosquitoes that carry the disease.
Symptoms of the disease include fever, chills, headache, abdominal pain, nausea, jaundice, internal bleeding, and kidney or liver failure. There is no medical treatment available for the disease, other than keeping the fever down and preventing dehydration.
The most effective way to prevent infection is to avoid getting bitten by mosquitoes. A vaccine is also available and provides protection for 10 years.
The World Health Organization (WHO) estimates that there are 200,000 cases of yellow fever each year, nearly all in sub-Sahara Africa. An estimated 5% of the people infected will die. During epidemics, this rate may be as high as 50%.
You can look at the information provided by the Center for Disease Control.
