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Interesting - it's part of the routine childhood schedule in the US but not in the UK. From NHS: "Why isn't the chickenpox vaccination part of the routine childhood immunisation schedule?"

https://www.nhs.uk/conditions/vaccinations/chickenpox-vaccin...

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Paraphrased: Herd immunity created by most people getting the chicken pox vaccine would make it less likely for people who did not get the vaccine to get chicken pox early in life, leaving them susceptible to contracting it later in life.

It sounds like those people should also get vaccinated, rather than not requiring anyone to be vaccinated.

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