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. 2020 Sep 25;11:518060. doi: 10.3389/fmicb.2020.518060

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Copyright © 2020 Mei, Sun, Blackall, Xian, Li, Gong and Wang.

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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Clinical scores observed in the vaccination-challenge trial. Four weeks after the second immunization, all chickens from each group were challenged with one of the three serovars of A. paragallinarum, by intranasal inoculation. Clinical signs of infectious coryza were recorded for 7 days postchallenge. Data were given as mean values of clinical signs in each group. Within each serovar, the vaccinated/challenge group has a lower clinical signs score at each observation day than the control group.