The World Health Organization reports (15 November 2018) a risk of yellow fever in Sudan. The government of Sudan requires proof of a yellow fever vaccination certificate for
travellers arriving from or having transited through
countries with risk of yellow fever transmission.
- Transit Without Visa with a confirmed onward ticket for a flight to a third country within 6 hours. Must stay in the international transit area of the airport and have documents required for the next destination.
U.S. policy on dual nationality can be found
Stay is extendable.
Embassy states: "Passport...should not have Israeli Visas of Immigration stamps affixed to it"