Herd Immunity

Jarlath O'Brien

The last few years has seen a rise in the number of cases of measles in the United Kingdom. The reduction in the percentage of children being vaccinated, either with MMR or with the single measles vaccine, makes it easier for the virus to spread and this has prompted action from policy makers and health professionals.

Vaccination works on herd immunity, meaning that a certain percentage of the population need to be vaccinated to make it extremely difficult for the virus to spread. This varies from virus to virus, but for measles herd immunity is achieved when 95% of the population are vaccinated. Above this number everyone’s happy. Below it, things start to happen.

In this case 95% can be effectively considered to be ALL.

In the field of education it is obvious that the only figure we can use to define all children is 100%. Unfortunately politicians develop policies that…

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