Pre-infection vitamin D3 levels association with severity of Covid-19 illness
journals.plos.org
journals.plos.org
They spend so much time outside that they naturally have good vitamin D levels.
Probably nothing. High vitamin D levels are a side effect of being outdoors a lot and therefore getting more exercise than the deskbound population. I recall during lockdown listening to a Slate Star Codex article (on the Astral Codex Ten podcast) which went through a stack of papers and concluded that there was nothing to see here.
The article should be retitled "Pre-Infection exercise levels associated with severity of Covid-19 illness".
https://astralcodexten.substack.com/p/covidvitamin-d-much-mo...
I stil remember the "horse dewormer" propaganda about ivermectin.
If you can't find it on Google, maybe you need to use Duckduckgo or even better, sign up for Kagi search beta. :)