Aid organizations raised concerns over an increase in suspected measles cases across displaced persons camps and host communities in Monguno local government area (LGA), Borno state. On 10 March, there were at least 131 suspected cases and six confirmed cases. Humanitarian health organizations have mobilized across camps and host communities and are intensifying the search for cases as well as isolating and treating suspected ones. Moreover, they have launched measles vaccination campaigns across hotspots in Monguno, prioritizing children who are the most vulnerable. Overcrowding across camps and host communities in the LGA increases the risk of the rapid spread of communicable diseases such as measles.