Tea for combating winter ailments

Here is a health article about combating winter ailments. I learnt that green tea and ginger tea are especially beneficial to those of blood type B. http://www.naturalnews.com/031143_antibiotics_winter.html

This website has a good suggestion on how to decaffeinate tea naturally (since high doses of caffeine can affect the nervous system). http://www.bukisa.com/articles/102249_how-to-decaffeinate-your-own-green-tea