Corrigendum to "The ETT2 transcriptional regulator EivF affects the serum resistance and pathogenicity of avian pathogenic Escherichia coli'" [Microb. Pathog. 161 (2021) 105261]. (April 2022) - Fu, Dandan; Li, Jiaxuan; Wu, Jianmei; Shao, Ying; Song, Xiangjun; Tu, Jian; Qi, Kezong