The article describes a measles vaccination campaign conducted by Doctors Without Borders in response to a large outbreak in Moba, Katanga, Democratic Republic of the Congo. The accompanying survey aimed to estimate vaccination coverage and identify reasons for non‑vaccination. Although the mass campaign achieved an estimated 87% coverage, this level was insufficient to prevent future outbreaks. Major barriers included limited access to remote villages, the absence of families during vaccination days, and low routine immunization coverage. The study highlights the need for improved social mobilization, longer vaccination periods, and better adaptation of campaigns to reach hard‑to‑access populations.
This complex investigation was led by Julita, an EPIET fellow whom I supervised in 2014–2015. While I was not directly involved in the field investigation, I contributed to the development of the study protocol and supported the preparation of the manuscript.