The serological status of ducks inoculated by LPAI H4 and H5 viruses and challenged by HPAIV H5N1 as evaluated by competitive ELISA, HI and serum neutralisation tests.

*The numbers indicate weeks after LPAIV inoculation.1The ELISA results indicated as the number of positives out of the number of tested birds.2Hemagglutination inhibition results indicate the geometric mean titre of (log2) serum samples and mean log2±standard deviation.3Carried out against AI virus A/cygnus cygnus/Germany/R65/06 (H5N1) and expressed as geometric mean titre of (log2) serum samples.4Before LPAIV H4N6 or H5N2 inoculation.5Post C. = 24 days post challenge. Before C. = the day of challenge, before inoculation of HPAIV.6None of the ducks with mean titre of 2.