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Fractionation of tea component and the Vpp assay. The HPLC fingerprint chromatogram of Sun-Link-Sea High-Mountain tea (A) and Oriental Beauty tea (B). The Vpp assay was used to determine the effect of indicated HPLC fractions of Sun-Link-Sea High-Mountain tea (C) and Oriental Beauty tea (D) on inhibiting omicron XBB.1.5 variant infection. The untreated group served as normalized control and its infection rate was set as 100%.
