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. 2022 Jun 16;13:927443. doi: 10.3389/fimmu.2022.927443

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Copyright © 2022 Sun, Zhang, Zhao, Yang, Shi, Xu, Liu, Guan, Shi and Liu

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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IHNV was injected on the 60th day after re-immunization, and the survival rate curve of oral pPG-612-CK6-G/L.casei 393 and the control group was observed within 14 days.