Mumps outbreaks across England and Wales in 2004: observational study

Abstract
Introduction In October 1988, routine immunisation against mumps was introduced in the United Kingdom as a combined measles, mumps, and rubella (MMR) vaccine for children aged 12-15 months. Although the incidence of mumps declined quickly, mathematical modelling supported the introduction of a second dose of MMR in 1996.1 In 1999, numbers of cases of mumps in teenagers in England and Wales began to rise. We report a further increase in the incidence of mumps in 2004.