Obviously, diseases like the cold and flu are cause by viruses, so weather alone wouldn’t cause it. So why do we get runny nose, sneezing, and other symptoms when we go out in the cold without a jacket?
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I once had a pulmonologist say that there are pathogens suspended in your mucus. When cold air dries the mucus out the pathogens come in direct contact with your tissues and enter your blood stream. I’ve not seen literature on this, though
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