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Antiviral activity of P. densiflora Siebold & Zuccarini essential oils (PDEOs) in combination Cells were infected with FCoV and simultaneously treated with PDEO for 2 h at 25 ± 1 °C. The results are shown for non-treated cells (negative control), defined as 100%. Viral titers were evaluated using the endpoint dilution method, expressed as log10 TCID50, and plotted against TEO at different concentrations.
