Fig. 1.

Inhibitory effects of Artemisia princeps var. orientalis essential oil on (A) FCV-F9 and (B) MNV-1. The essential oil was added at different time points during virus infection. The reduction of relative plaque formation (%) was evaluated using plaque assay oil (EO). DMSO and 2TU were used as the untreated control and positive control, respectively. All measurements were analyzed in triplicate. A single asterisk denotes significant decrease of plaque formation (%) relative to untreated control (p < 0.05)