Histopathological analysis showed that Y13 can cause systemic infection, the target organs including the liver, spleen, kidney, brain, gill and so on.

• 组织病理分析表明病原菌导致的感染是全身性的，病鱼的鳍、肝、脾、肾、脑以及鳃等部位都有不同程度的病变。