Country: Nigeria Sources: Health Cluster, World Health Organization Please refer to the attached file. This Situation Report provides an update on the cholera outbreak response in Borno State, Nigeria, covering the period from 1 to 22 May 2026. As of 22 May 2026, a cumulative 2,422 cholera cases and 24 associated deaths had been reported across seven LGAs, with a case fatality rate (CFR) of 1.0%. The report notes the continued geographic expansion of the outbreak, including newly affected Ngala LGA, and summarizes ongoing surveillance, laboratory testing, case management, WASH, risk communication, and multisectoral coordination activities.