[zahlman]

> Japan was among the first countries to vaccinate for chickenpox. The vaccine developed by Hilleman was first licensed in the United States in 1995.[17][60]

People (well, Americans and Canadians at least) in their 40s now generally didn't get vaccinated as children, as their parents didn't have the option. It will be different for the next generation.

[pkaye]

Interestingly UK took a different approach and only started offering chicken pox vaccines for children this year.

https://www.gov.uk/government/news/free-chickenpox-vaccinati...

[mlyle]

Which, if chickenpox is really the cause of a lot of dementia (as this article implies) might have been a pretty grave mistake.