ABSTRACT
In old China tea was first used as an antidote and in India as a kind of medicine for treatment of diarrheal disease. Tea is classified into four types, green tea, oolong tea, black tea, and pu-erh tea, on the basis of the manufacturing process. All of these teas are prepared from leaves of Camellia sinensis and its varieties. Tea has multifunctions as indicated in different chapters of this book. The antimicrobial activities, including antibacteria, antifungi, anti-caries and antivirus, of tea are the focus of this chapter.
