1. How virus infect us?
The infection mechanism of a virus is, if our body has an antibody to a specific virus, our antibody can catch the virus.
If not, the virus can connect to a cell joint to infect.
Catechins affix to the cell joints and help to inhibit the virus from connecting cells.
(Anti-virus effects, Japanese Society of Catechinology, Link to the page)
This research implies 1-5 cups/day of green tea consumption help inhibiting influenza infection in children.
(Park M et al. Green Tea Consumption Is Inversely Associated with the Incidence of Influenza Infection among Schoolchildren in a Tea Plantation Area of Japan, The Journal of Nutrition, Vol. 141, Issue 10, October 2011, P866, Link to this research paper)