Evaluation of the efficacy of avian pathogenic Escherichia coli bivalent live vaccine (serogroups O 1 &2) against Escherichia coli infection in broilers - Jiayan Wu; Luyao Jiang; Baoxiu Wang; Hang Wang; Qingqing Gao; Changchao Huan; Song Gao (Veterinary Microbiology, 2026)