Lessons learned around RCCE in outbreak responses in East and Southern Africa recognise the need to learn from and strengthen national and cross-border collaboration in the face of frequent public health emergencies. In October 2023, One Health partners conducted a Simulation Exercise in the Mandera region between Ethiopia, Kenya, and Somalia to test cross-border readiness. One of the key recommendations from this workshop was that current and future agreements, plans, and SOPs on One Health Emergency Preparedness and Response (EPR) in all three countries should include RCCE for cross-border situations.