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> This is definitely true, but not exactly news to most people

A lot of people believe it’s true, but having a proof of it is newsworthy. This is an old theory and there’s still no 100% scientific consensus on whether it’s true or not [1][2].

[1]: https://en.wikipedia.org/wiki/Hygiene_hypothesis

[2]: https://www.verywellfamily.com/hygiene-and-cleanliness-won-t...

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I do take my rather glib comment back, with apologies to the readers here, I know better than that. Indeed, the Hygiene Hypothesis is misused a lot, and which I was actively looking up post-comment. It's the reason a lot of people are - erroneously - trying to infect themselves with COVID-19, to prorect themselves from later catching... the very same harmful pathogen.

See https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320962/

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