<p>A cases investigation was conducted from the 10th to the 15th of January 2023. To identify additional cases, we reviewed outpatient registers and abstracted patient details. Contacts were screened and blood samples were collected from symptomatic children. A suspected case was defined as any resident of Lumezi presenting with fever and a generalized maculopapular rash, or in a patient whom a health care worker suspected measles. A confirmed case was a suspected case with laboratory confirmation of a positive IgM antibody. Cases were also linked epidemiologically. To identify the risk factors, we collected data on vaccination status and travel history by using measles case investigation form.</p>