The societal role of lifelong vaccination.

The full economic and societal value of vaccination is complex to assess. Although direct protection is the immediate goal of vaccination programmes, it is rare that 100% uptake is attained. An important facet of vaccines value comes from the indirect (or herd) protection they provide. The evolving dynamics of our society, including the increase in the proportion of older individuals enhances the value of indirect protection in reducing disease transmission within the family setting and the society as a whole. For example, grandparents are increasingly involved in childcare, putting them at risk of disease transmission if they or the children are not vaccinated. Preventing disease in children can also reduce absenteeism for parents who otherwise would take days off work to care for their sick children, leading to a substantial societal burden. Preventing disease in working adults reduces absenteeism and presenteeism, enhancing productivity and contributing in turn to economic growth. Quality of life is essential at all ages. It is fundamental in children for their life chances, educational achievements, and healthy wellbeing. Additionally, preventing common diseases in adults and the elderly also contributes to their quality of life and helps to assure healthy ageing for growing ageing populations. These wider economic and societal values, although difficult to measure, should be taken into consideration in assessments of the economic value and cost-effectiveness of vaccination programmes.