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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. 3 — Virus titer and HI antibody responses of chickens and ducks intravenously infected with the H9N2 virus. a - c Virus titers were determined in 13 different organs of birds at the indicated time points: 1 dpi (a), 2 dpi (b), and 3 dpi (c). d An HI assay was used to test the serum samples of the birds at the indicated time points. dpi: days post-infection