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. 2017 Jul 18;7:5705. doi: 10.1038/s41598-017-05940-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Protective immunity after lethal challenge with homologous virus of mice immunized during pregnancy. Immunized groups were challenged with mouse adapted A/Brisbane/59/07 (H1N1) virus 4 weeks after immunization. (A and C) Body weight changes and (B and D) survival rates after challenge with 5xLD₅₀ of virus were monitored for 14 days. Values are expressed as mean +/− SEM. (n = 5–14). Groups and animal numbers are as described in Fig. 2; *p < 0.05; **p < 0.01.