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. 2019 Apr 11;16:46. doi: 10.1186/s12985-019-1150-8

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Antibody response in chickens and ducks intravenously infected with inactivated H9N2 virus. a and c An HI assay was used to test the serum samples of the birds at different time points post-infection as indicated. b and d A blocking ELISA was used to test the serum samples of birds at different time points post-infection as indicated;**, p < 0.01. a and b present the samples collected at the indicated time points in the same infection experiment. c and d represent the samples collected at different time points post-infection as indicated in another duplicate independent infection experiment