[名词解释] 感染阶段infective stage

辙叉由翼轨和心轨组成，翼轨的始终端称为辙叉（）。 ["A、前趾后趾","B、趾端跟端","C、岔前岔后","D、岔尖岔尾"] 免疫逃避immune evasion 带虫免疫Premunition 保虫宿主reservoir host 转续宿主paratenic host 感染阶段infective stage