Scientists now have a very strong theory to why there is a flu seson in winter. http://www.nytimes.com/2007/12/05/health/research/05flu.html?no_interstitial
This researched shows virus being spread and active in cold, low humidity climate. Scientists used guinea pigs as test subjects changing the air around them and experimenting-
The virus was transmitted best at a low humidity, 20 percent, and not transmitted at all when the humidity reached 80 percent.
The animals also released viruses nearly two days longer at 41 degrees than at a typical room temperature of 68 degrees.
To me this helps because if people dress warmer and keep their houses warmer, catching a flu is less likely to happen...
A picture of a flu virus, also called influenza: http://images.google.com/imgres?imgurl=http://www.rkm.com.au/VIRUS/Influenza/FLU-images/VIRUS-FLU-structure-L-500.jpg&imgrefurl=http://www.rkm.com.au/VIRUS/Influenza/flu-structure.html&h=500&w=500&sz=97&hl=en&start=5&um=1&tbnid=A5EWW3gPP2FTpM:&tbnh=130&tbnw=130&prev=/images%3Fq%3Dinfluenza%2Bvirus%26svnum%3D10%26um%3D1%26hl%3Den%26rls%3DGWYA,GWYA:2006-18,GWYA:en%26sa%3DX
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