New diseases are, by definition, poorly understood when they emerge, and this is most especially true when the causative agent is an influenza virus.
从定义上讲，人们对新出现的疾病了解很少，从病原体是流感这一点上可以看到这一点。
Following confirmation of Marburg virus as the causative agent, on 21 March, WHO sent its senior epidemiologists to Uige to assess the situation and organize an initial emergency response.
在确认马尔堡病毒为致病病原体之后，世卫组织于3月21日向威热派出其高级流行病学家以评估事态和组织初期紧急应对。
The condition or causative agent, such as a bacterium, fungus, or virus, that results in blight.
如细菌、真菌或病毒等导致枯萎病的条件或起因。
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