Almost all the cases of mumps involve adolescent British children . Outbreak traced to Jews who immigrated to United Kingdom during the outbreak . Severe cases of infection can lead to brain damage and deafness . It 's the largest outbreak in the UK since 2006 .
Almost all the cases of mumps involve adolescent Orthodox Jews . Outbreak traced to boy who went to United Kingdom during mumps outbreak . Severe cases of mumps can lead to brain inflammation and deafness . It 's the largest outbreak in the U.S. since 2006 .