Anisakis simplex larvae is the most important causative agent of anisakiasis.

异尖线虫病的主要致病源是简单异尖线虫幼虫。

Identifying the specific causative agent is not always possible.

要鉴定特异的病因并不总是可能的。

Mycobacterium tuberculosis is the causative agent of tuberculosis.

结核分枝杆菌是造成结核病的致病菌。

Plasmodium is a protozoan which causes malaria; it is the causative agent of the disease.

疟原虫是引起疟疾的原生动物；是疾病的病原体。

An enterovirus separable into three serotypes that is the causative agent of poliomyelitis.

脊髓灰质炎病毒一种肠道病毒，可分为三种血清型，它是导致脊髓灰质炎的媒介。