MMR Uptake in Somerset following the 2009 national catch-up campaign: factors affecting parents’ decisions to accept or decline immunisation

Introduction and Background Measles, mumps and rubella (MMR) are infectious diseases, primarily of childhood, which cause significant mortality and morbidity globally. These infections are, however, vaccine preventable and there is potential for them to be eradicated worldwide through the strategic use of organised population immunisation programmes. Following the introduction of the MMR vaccination in the UK in 1988, uptake was initially good and a high level of population vaccination coverage was achieved. This was sustained until 1998 when a study by Dr Wakefield and colleagues was published in the Lancet suggesting the theoretical possibility of an association between MMR and Autism /bowel disease. Intense media coverage followed, uptake of MMR vaccine fell to less than 80% in Somerset, and community outbreaks of measles, which had almost been eliminated in the UK, began to reappear. The Wakefield study was subsequently discredited and was eventually retracted by the Lancet in 2010. In August 2008 the Chief Medical Officer announced a national MMR catch-up campaign, targeting all children between the age of 13 months and 18 years who had either not been vaccinated against measles, mumps and rubella, or had only partial immunisation. These children were invited again for vaccination and the campaign was completed in January 2009. This study was undertaken to explore, in depth, the quantitative data available in respect of the uptake of MMR at the time of the 2009 campaign, and also to provide new qualitative data in relation to the attitudes, beliefs and experience of MMR and immunisation services of parents who continued to decline MMR for their children after the 2009 campaign, in order to identify factors which affected parental decision-making, add to the wider knowledge base, and to use this knowledge to improve the future development of immunisation services in Somerset.