It has been identified that all the cases have been caused by the same strain of the virus suggesting the infections are linked, although there is no evidence that the virus has changed to spread more easily. Measles is the most infectious infection that we know and it really is very good at seeking out those few members of the community that have not been vaccinated, said Dr Brown. I don't think it will be of the numbers we had for the Swansea outbreak, which was predominantly affecting school-age children. But there is still the potential for us to have an increasing number of cases, especially in young adults and they are the ones that tend to be hospitalised and don't do as well.
Dr Brown said that unvaccinated older people thought they had dodged the bullet with measles, but in fact needed to be vaccinated. MMR (measles, mumps and rubella) immunisation rates are now at record levels in children due to vaccination. There has been little spread of the infection to school-age children so far, which suggests there is a high level of protection in those age groups.