This research aimed to analyze the relationship between measlesoutbreaks and municipal vaccination coverage in the 11th Health Region of Sobral, northwest of Ceará, which occurred between 2013 and 2015. To that end, a mixed study by source of secondary data, extracted in the health region was elaborated. For quantitative analysis, a total of 766 reports of suspected measles cases were investigated. Also, post-epidemic field research was carried out with professionals involved in immunization, by applying 31 electronicquestionnaires. The analyzes of the information allowed us to identify that 451 notified cases of the disease were discarded; 65 were considered inconclusive; and 217 were confirmed. The professionals involved pointed out the following as the cause of the outbreaks low vaccination coverage, pockets of susceptible people, lack of training of professionals and inexperience in containing blockages. The vaccinationstrategies prioritized the immunization of the population at risk, the reorientation and systematization of blocking and scanning actions. (AU)