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Dr.J at Common Sense Medicine's avatar

Arundel, writing on humidity and respiratory health, showed optimal humidity for nasal defenses at 40 to60%. That’s what is common outdoors. Living in our drier indoor environments is what causes cold season and enables pandemics.

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Robin Whittle's avatar

The most obvious explanation for this is that being outside a lot more than most other people, homeless people will be more exposed to the ~297 nanometre UV-B light which converts 7-dehydroxcholesterol in their skin to vitamin D3 cholecalciferol.

This won't necessarily mean their circulating 25-hydroxyvitamin D (25(OH)D) levels are at least 50 ng/mL (1 part in 20,000,000 by mass), which is what is needed for full immune system function. However, they would, in general, have higher 25(OH)D levels than most other people who do not supplement vitamin D3. Such people usually have levels in the range 5 to 25 ng/mL, which means their innate and adaptive immune responses to cancer cells, bacteria, fungi and viruses are very much weaker (crippled) compared to what they would be with 50 ng/mL or more 25(OH)D AND they are at much greater risk of self-destructive, indiscriminate cell destroying, wildly dysregulated inflammatory responses.

Please see the research articles on vitamin D and the immune system cited and discussed at: https://vitamindstopscovid.info/00-evi/ (Co-signed by Patrick Chambers MD: https://www.researchgate.net/profile/Patrick-Chambers-4/).

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