In Africa, we experience more than 140 outbreaks every year: viral outbreaks, bacterial outbreaks, or outbreaks of unknown causative agent.

在非洲，我们每年经历 140 多起：、细或未知原体。

While adenovirus is a possible hypothesis, investigations are ongoing for the causative agent.

虽然腺是一种可能的假设， 但正在对原体进行调查。

Diseases can also be classified by their causative agents.

例如，传染也叫作可传播疾，就是一种人与人之间传播的疾，比如以咳嗽和打喷嚏形成的空气飞沫的方式来传播的疾。

The bacteria Bacillus Cereus was identified as the causative agent.

细芽孢杆（Bacillus Cereus）被鉴定为致因子。

Treatment of precancerous lesions begins with active surveillance, removing any diseased tissue, and stopping any causative agents, like smoking and alcohol abuse.

癌前变的治疗要从积极监测开始，任何变组织都要被去除，还要停止接触一切致癌物，如戒烟戒酒。

So this could be COVID-19 a vaccine against SARS-coronavirus-2, SARS-CoV-2, the causative agent of COVID-19.

所以这可能是 COVID-19，一种针对 SARS-coronavirus-2、SARS-CoV-2 的苗，SARS-CoV-2 是 COVID-19 的原体。

Whatever the causative agent might be, it survives in the person it infects and is passed on to another.

有时，一个致的有机体侵人人体后，却没有显示疾症。