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2005年5月22日有媒体报道：青海省刚察县境内部分候鸟异常死亡，截止到5月8日，青海湖已有178只斑头雁确诊死于禽流感H5N1病毒。当地卫生检疫部门对已对进入疫区的车辆进行严格检查，并彻底消毒；青海湖鸟岛旅游区已经封闭。从预防传染病的角度，当地卫生检疫部门所采取的措施属于（）
A . 控制传染源
B . 切断传播途径
C . 保护易感者
D . 计划免疫
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