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. 2016 Sep 8;12(1):194. doi: 10.1186/s12917-016-0834-1

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© The Author(s). 2016

Open AccessThis 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. 1 — Serum antibody (IgM) response following oral vaccination with a feed-based vaccine. Double booster at weeks 2 and 6 prolonged the high antibody levels for up to 12 weeks compared to the single booster at week 2 that lasted 6 weeks