Almost all the cases of mumps involve adolescent British children . The mumps outbreak also spread to Ocean County , New Jersey , where 159 confirmed cases have been diagnosed since September , county spokeswoman Leslie Terjesen told CNN . 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 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 .