Repeated introductions and intensive community transmission fueled a mumps virus outbreak in Washington state
In 2016 and 2017, Washington state experienced a large outbreak of mumps. We sequenced the genomes of mumps viruses collected in Washington and other US states during the outbreak in 2016/2017, as well as historic mumps samples dating back to 2007. We use these sequences to enumerate patterns of introduction and subsequent spread of mumps in Washington.