Children under the age of 6 are exempt from presenting COVID-19 PCR test result.
All foreigners departing Sudan are required to present a certified negative PCR test certificate dated within 72 hours prior to departure.
Children under the age of 2 are exempt from presenting a COVID-19 test.
Travelers with proof of recovery from the virus within the last 90 days prior to boarding. Proof of a recent positive viral test and a letter from your healthcare provider or a public health official stating that you were cleared to travel.
More info at the CDC site
Travelers who did not get tested, are advised to stay home and self-quarantine for 10 days after travel.