Figure 2From: In Vitro inhibitory activity of Alpinia katsumadai extracts against influenza virus infection and hemagglutinationAntiviral activity of AK extracts and AK fractions before virus attachment in pre-treatment assay. MDCK cells were pre-incubated with AK extracts and AK fractions 12 h prior to infection of influenza virus (A/PR/8/34 [H1N1] and A/Chicken/Korea/MS96/96 [H9N2]). Antiviral effects were determined by formation of cytopathic effect and plotted as a percentage of cell control (uninfected) and virus control (untreated). AK-1: EtOH extract; AK-2: EtOAc fraction; AK-3: H2O fraction; AK-5: 40% methanol fraction; AK-9: H2O extract; AK-10: Polysaccharide fraction; AK-11: Supernatant fraction.Back to article page