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Microscopic analyses of H9N2 influenza virus infected A549 cells after 48 h incubation with different concentrations of Sambucus nigra (EF) extract (100X magnification).the influenza-virus infected A549 cells became rounded and eventually detached in (A) treatment with 40 and 80μg/mL of EF in compared with the uninfected cells (mock), while the CPE was not observed in (B) trial
