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H2 IgG Characterization and Potency of H2 Vaccine. (A) Dilutions of H2 A/chicken/Ohio reference antigen were analyzed by SRID using the H2 reference antibody or the IgG antibodies made to the A/chicken/Ohio ectodomain (H2‐ED) rHA. The zone size (mm) refers to the diameter of the measured precipitin rings. (B) Potency of the H2 A/chicken/Ohio vaccine was determined using the H2 reference antibody or the IgG antibodies made to the A/chicken/Ohio ectodomain (H2‐ED) rHA.
