Report of simultaneous measles outbreaks in two different health regions in Portugal, February to May 2017: lessons learnt and upcoming challenges Augusto, Gonçalo Figueiredo and Silva, Andreia and Pereira, Natália and Fernandes, Teresa and Leça, Ana and Valente, Paula and Calé, Etelvina and Aguiar, Bárbara Andreia and Martins, António and Palminha, Paula and Vinagre, Elsa and Cordeiro, Rita and Lopo, Sílvia and Nogueira, Paulo Jorge, Eurosurveillance, 24, 1800026 (2019), https://doi.org/10.2807/1560-7917.ES.2019.24.3.1800026