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Comparison of serum hemagglutination inhibition (HI) antibody titers against the H5N3 vaccine and H5N1 field virus following vaccination with either a single vaccine (H5N3) or two successive heterologous vaccines (H5N9 and H5N3). HI titers against the vaccine component (A/ck/VN/C58/04; H5N3) and the field strain (A/Mallard/It/3401/05; H5N1) were determined in 338 birds 12 weeks after starting VP2.
