http://articles.mercola.com/sites/articles/archive/2000/07/30/sun-immunity.aspxMany people have previously assumed that it was the cold weather that brings on an increase in infectious diseases in the winter. However, winter disease may be more closely linked to reduced sunlight, than to cold weather. Pneumococcal infections areenCommunityServer 2008.5 SP1 (Build: 31106.3070)