Fig. 1From: The response of mute swans (Cygnus olor, Gm. 1789) to vaccination against avian influenza with an inactivated H5N2 vaccine a Mean log2 HI titers against the H5N2 antigen in control (C) and vaccinated mute swans (D1, D2). b Mean log2 HI titers against the H5N2 antigen in mute swans (group D2) and racing pigeons. Interpretation: HI ≥ 4 log2 (16) positive, HI < 4 log2 (16) negative. Small letters (a, b, c) denote significant differences in log2 HI titers between groups in successive weeks based on the results of the Kruskal–Wallis test. Capital letters (A, B, C) denote significant differences in log2 HI titers between weeks (0, 2, 4, 6, 8) within groups based the results of the on Kruskal–Wallis testBack to article page