上麵引用的文獻，說明茶葉可將感染幾率降低2-3個數量級，即降低至1%～0.1%。另一篇文章，茶葉濃度很低，

1個茶包/150毫升水，再至少稀釋20倍，仍有強大的抑製效應，

Epigallocatechin gallate from green tea effectively blocks infection of SARS-CoV-2 and new variants by inhibiting spike binding to ACE2 receptor，https://cellandbioscience.biomedcentral.com/articles/10.1186/s13578-021-00680-8 

你可以去看該論文的圖片 https://cellandbioscience.biomedcentral.com/articles/10.1186/s13578-021-00680-8/figures/2