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. 2022 Apr 20;13:882796. doi: 10.3389/fimmu.2022.882796

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Copyright © 2022 Ning, Huang, Wang, Cheng, Jia, Liu, Zhu, Chen, Zhao, Zhang, Yang, Wu, Huang, Tian, Ou, Mao, Gao, Sun, Yu and Zhang

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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The ducklings were challenged after immunization, and the clinical symptoms of the ducklings after the challenge were observed. (A) Eyelid condition. (B) Rectal temperature (left) and survival rate (right).