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. 2019 Sep 10;8(3):145. doi: 10.3390/pathogens8030145

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schematic diagram showing the experimental design. NDV: Newcastle diseases virus, ELISA: enzyme-linked immunosorbent assay, HI: haemagglutination inhibition test, LTT: lymphocyte transformation test, dpc: days post challenge.