tarda Subunit Vaccine OmpV Ming Guo 1, Xiaoqian Tang 1,2, Xiuzhen Sheng 1, Jing Xing 1 and Wenbin Zhan 1,2,* 1 Laboratory of Pathology and Immunology of Aquatic Animals, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; guominghx@163.com (M.G.); tangxq@ouc.edu.cn...