In late 2012, a yellow fever outbreak occurred in the Darfur region of Sudan that was the largest yellow fever epidemic to strike Africa in two decades.[1] On 10 January 2013, the Sudan Federal Ministry of Health and the World Health Organization (WHO) reported that there had been 847 suspected cases since 2 September 2012, including 171 deaths, for an estimated case fatality rate of 20%. A mass vaccination campaign was launched in mid-November.[2] By early January, the five states of Darfur were free of any new cases.