<p>background: &nbsp;</p><p>Measles is a febrile rash illness caused by a Morbillivirus, which belongs to the Paramyxovirus family. It spreads from person to person through airborne droplets. In many African countries, it ranks as the fourth leading cause of mortality among children under five years of age. The illness begins with prodromal symptoms such as fever, malaise, cough, coryza, and conjunctivitis, followed by the appearance of a maculopapular rash. This rash typically emerges around 14 days after exposure, although the incubation period can vary from 7 to 21 days. Measles can pose serious health risks to individuals of all ages, but children under five and adults over 20 are particularly vulnerable to complications. Unvaccinated young children and pregnant women are at the highest risk of contracting measles and experiencing severe complications, including death.&nbsp; To determine the magnitude and determinants of Measles outbreak in Kuergeng town, Lare district, Nuer zone, Gambella region, 2022. &nbsp;</p>