Rapid and accurate identification of etiologic agent is the key to control the disease.

因此，快速、正确地确定病原体是控制疾病的关键。

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The interaction of host, agent, and environment makes up the disease cycle.

宿主，病原和环境之间相互作用形成了疾病周期。

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Such an organism is called an agent of disease; it is a parasite.

这样的生物体称为病原体，是属于寄生物。

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Such an organism is called an agent of disease; it is a parasite.

这样的生物体称为病原体，是属于寄生物。

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