This vaccination must be given at least 10 days before entering the country.
Yellow fever is a virus infection. The infection is caused by an infected mosquito. The disease occurs in Africa and South-America. People who are infected feel sick after 3-6 days. The symptons of the infection are much like the symptoms of a flu, because of the fever and myalgia. Besides, there may be complications like jaundice, encephalitis and bleedings, which can be deadly.
Protection: life long
In some countries, this vaccination is mandatory for getting a visa.