1) Bihar conducted a Measles Catch-up Campaign in 5 districts targeting over 2.7 million children aged 9 months to 10 years. 2) The campaign saw strong state-level coordination and oversight. Over 24,000 vaccination sites were set up across 64 blocks. 3) Monitoring of nearly 10,000 sessions found high coverage, though some children were left out due to lack of information. A few AEFI cases were reported and duly managed. 4) Lessons learned include best practices around training, monitoring, and AEFI management, as well as areas for improvement such as coordination, microplanning, and information dissemination. Bihar plans to conduct Phase 2 across its remaining 33