The true risk isn't to the children who haven't had the vaccines, it's to the immunocompromised that are quite literally being murdered because of some parents ignorance. It isn't the 16-65 age bracket that's being affected here, the immunodeficient can typically be any child under 16, any senior over 65, pregnant women, people with existing infections (even as simple as a cold) and those with HIV/AIDS.<p>In my honest opinion, and this one is quite a rare one for me, this is a subject where the UK health services should take a page out of the US' book. MMR vaccines should be mandatory for attending school. This would place these parents in a serious catch 22, as home-education in the UK is exceptionally harder to do than in the US (as in it's virtually unheard of). It will place these parents in a position where they have a choice inoculation, segregation (no admission to public schools until immunisation) or prison (in the UK parents are fully responsible for placing their child into an educational institute and ensuring they attend, if they don't they can face jail time).