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The AIV (H9N2) titer at TCID50 test (log 10). TCID50/ml was increased as the concentration of M. Officinalis essential oil decreased. a Adding MOEO at pre infection stage, b adding MOEO at post infection stage, c adding MOEO and virus at same time, d Oseltamivir. Each value is the result of mean ± SD of three independent experiments (P ≤ 0.05)
