Three in vitro studies have shown that epigallocatechin gallate strongly inhibits HIV replication (Fassina et al 2002, Chang et al 1994, Tao 1992). The theaflavins from black tea have shown even stronger anti-HIV activity in vitro by inhibiting viral entry into target cells (Liu et al 2005). Antiviral activity has also been identified against Epstein-Barr virus, HSV-1, influenza A and B, rotavirus and enterovirus (Chang et al 2003, Imanishi etal 2002, Mukoyama etal 1991, Tao 1992, Weber et al 2003). Antiviral activity seems to be attributable to interference with virus adsorption (Mukoyama etal 1991).
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