Figure 1From: In Vitro inhibitory activity of Alpinia katsumadai extracts against influenza virus infection and hemagglutinationAntiviral assay strategies with AK extracts and AK fractions on different stages of virus infection. At 12 h prior to virus infection for pre-treatment assay (A), at the same time after virus incubation with AK extracts and AK fractions at 4°C for 1 h for simultaneous treatment assay (B), and at 1 h later of AK extracts after viral infection for post treatment assay (C).Back to article page