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Effect of saikosaponin B2 on HCoV‐229E attachment. Cells were prechilled at 4°C for 1 h, followed by inoculation with HCoV‐229E (100 TCID50) of the cell monolayer in the absence or presence of test compound. After 3 h incubation, percentage attachment of the test compound‐treated group was evaluated using the XTT assay. Data are the mean±SD of three independent experiments. *P < 0.05 between different doses of saikosaponin B2 (one‐way anova).
