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. 2019 May 6;374(1775):20180259. doi: 10.1098/rstb.2018.0259

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© 2019 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — Seropositivity of swans. (a) Percentage of swans with antibodies targeting AIV NP by year of hatching and date of sampling. Colours represent birds hatched in different years. Adjusted Wald 95% confidence intervals are given. The date of the HPAI H5N6 outbreak is marked. (b) Percentage of swans with titres greater than 8 for HPAIV H5N8 (A/Turkey/England/16) (blue) and LPAIV H5N3 (A/Teal/England/06) (orange). Birds that were sampled on more than one occasion have been removed. If a bird was found to be seronegative for previous AIV exposure by NP-ELISA, it is included here as having a titre less than or equal to 8, despite HI assays not being conducted for that sample. Samples were collected during June, July and November 2017, but birds are grouped by hatch year only as no seasonal trend in change in titre was observed in these data.