Fig. 2From: The response of mute swans (Cygnus olor, Gm. 1789) to vaccination against avian influenza with an inactivated H5N2 vaccine a Mean values of the S/N ratio in ELISA for control and vaccinated mute swans (groups C, D1, D2). b Mean values of the S/N ratio in ELISA for mute swans (group D2) and racing pigeons. Interpretation: cut-off: S/N = 0.5, S/N < 0.5 positive, S/N ≥ 0.5 negative. Small letters (a, b) denote significant differences in the values of the S/N ratio between groups in successive weeks based on the results of Fisher’s multiple comparison procedure. Capital letters (A, B) denote significant differences in the values of the S/N ratio between weeks (0, 2, 4, 6, 8) within groupsBack to article page