EGCG-induced inhibition of HIV-1 infectivity. HIV-1 p24 antigen production in freshly isolated human CD4+ T cells (●) and macrophages (▲) was measured by ELISA with subtype B, R5-HIV-1Ba-L for 7 days in the presence of EGCG, medium, control catechin, (−)-catechin, or ritonavir. The data are expressed as means ±SD of three separate experiments.