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Plaque reduction assay from time-of-addition assay: (a) pre-infection condition, (b) post-infection condition treatments, and (c) Acyclovir control. Results are the mean ± SD of triplicate experiments, and asterisks indicate a significant p-value (* p < 0.05, ** p < 0.01, *** p < 0.001 and **** p < 0.0001). OESY, extract of O. europea var. sylvestris; OESA, extract of O. europea var. sativa.
