Figure 1From: Serological characterization of guinea pigs infected with H3N2 human influenza or immunized with hemagglutinin proteinAnalysis of serum pools from infected guinea pigs. Serum pools were tested for total HA-binding antibodies by reactivity to full-length HA protein in a standard ELISA (solid), and antiviral titers using HI assay (dashed). Arrows along X-axis indicate inoculation dates for Group 2. Error bars for the ELISA extinction titers are shown, but are not readily seen due to their small size.Back to article page