Although, according to Dr John Cannell, despite "...at least 5 studies** show(ing) an inverse association between lower respiratory tract infections and 25(OH)D levels or sunshine. That is, the higher your 25(OH)D level, the fewer colds and flu"...scientists at the CDC and WHO are thinking only in terms of vaccines or TamiFlu,
not in terms of strengthening the innate immune system with Vitamin D:
...Many of these scientists have financial connections to the influenza industry. However, It is not a conspiracy. When I was young, I thought most things were conspiracies. Now that I am older, I know it is not a conspiracy, only incompetence.
...
**
Laaksi I, Ruohola JP, Tuohimaa P, Auvinen A, Haataja R, Pihlajamäki H, Ylikomi T. An association of serum vitamin D concentrations < 40 nmol/L with acute respiratory tract infection in young Finnish men.
Am J Clin Nutr. 2007 Sep;86(3):714–7.
Karatekin G, Kaya A, Salihoğlu O, Balci H, Nuhoğlu A. Association of subclinical vitamin D deficiency in newborns with acute lower respiratory infection and their mothers.
Eur J Clin Nutr. 2009 Apr;63(4):473–7.
Ginde AA, Mansbach JM, Camargo CA Jr. Association between serum 25-hydroxyvitamin D level and upper respiratory tract infection in the Third National Health and Nutrition Examination Survey.
Arch Intern Med. 2009 Feb 23;169(4):384–90.
Wayse V, Yousafzai A, Mogale K, Filteau S. Association of subclinical vitamin D deficiency with severe acute lower respiratory infection in Indian children under 5y.
Eur J Clin Nutr. 2004 Apr;58(4):563–7.
Termorshuizen F, Wijga A, Gerritsen J, Neijens HJ, van Loveren H. Exposure to solar ultraviolet radiation and respiratory tract symptoms in 1-year-old children.
Photodermatol Photoimmunol Photomed. 2004 Oct;20(5):270–1.