This statement summarizes why I may have not caught cold or flu for 2 years:

Studies have shown that garlic (or some chemical compounds, such as allicin in garlic) is very effective at killing the numberless microorganisms that cause some of the most common and rare infections, including colds.
Informative article...I consumed just now in my omelet, 1 clove of garlic cut up in it....yum yum