Antiviral and Antioxidant Activity of a Hydroalcoholic Extract from Humulus lupulus L.

Figure 2

Viral titer measured in supernatants of A549 cells infected with different influenza A virus strains and treated with 140 μg/ml HOP extract 1 h before the infection (b.i.), during the 1 h adsorption period (d.i.), and after the adsorption (postinfection: p.i.) or before, during, and after the infection (b.d.p.i.). Viral production was determined 24 h p.i. by hemagglutinating assay and expressed as percentage of HAU, (where titer from the untreated, infected cells was considered 100%). Data are mean ± SD from three independent biological replicates, each one performed in two technical replicates (). versus untreated infected cells by Student’s -test.