Other evidence: What they discovered was that when a virus invaded warmer cells, the host cells produced significantly more interferons -- proteins that "inter

Other evidence: What they discovered was that when a virus invaded warmer cells, the host cells produced significantly more interferons -- proteins that "interfere" with the spread of a virus by warning healthy cells of its presence and setting off an immune response. In the cooler nasal cavity cells, this warning system was less efficient however, and allowed the virus to spread more easily. http://www.smithsonianmag.com/smart-news/there-scientific-reason-cold-weather-could-cause-colds-180953817/ http://www.smithsonianmag.com/smart-news/there-scientific-re...