Fig. 4From: Antiviral activity of phenanthrenes from the medicinal plant Bletilla striata against influenza A virusHemagglutination inhibition of phenanthrenes from Bletilla striata. The hemagglutination inhibition assay was used to test the hypothesis that B. striata compounds interfere with viral attachment. However, the results showed that the compounds could not inhibit hemagglutination by the influenza virusBack to article page