vaccines become effective when enough members of a community vaccinate their children, a concept called “herd immunity.” Because a miniscule percentage of children in a community remain immune to a vaccine, rendering it ineffective, to keep the community safe from measles, for example, requires at least 92% of the children of a community to be vaccinated.
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Originally Posted by Esaias
If vaccinations keep people safe from disease, how can a non-vaccinated child possibly be a threat to vaccinated children?
Oh, wait... the threat isn't medical, it's something far more dangerous. It's ideology.
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Their explanation is that vaccines are only effective if enough community members vaccinate their children - herd immunity - and that because a very small percentage of children remain immune to a vaccine in a community, rendering the vaccine ineffective, they need 92% of the children to be vaccinated in a community to keep that community safe.