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Inhibition of H9N2 influenza virus replication in the presence of different concentrations of Sambucus nigra (EF) extract was determined. The titer of virus in A549 supernatants was assayed by TCID50 in trials (A) and (B) with 40 and 80 μg/mL of EF compared to the virus-infected and EF-untreated cells (mock
