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 多起疫情：病毒疫情、细菌疫情或未知病原体疫情。

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

癌前病变的治疗要从积极监测开始，任何病变组织都要被去除，还要触切致癌物，如戒烟戒酒。

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

虽然腺病毒是能的假设， 但正在对病原体进行调查。

Diseases can also be classified by their causative agents.

例如，传染病也叫作传播疾病，就是人与人之间传播的疾病，比如以咳嗽和打喷嚏形成的空气飞沫的方式来传播的疾病。

The bacteria Bacillus Cereus was identified as the causative agent.

细菌蜡状芽孢杆菌（Bacillus Cereus）被鉴定为致病因子。

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

有时，个致病的有机体侵人人体后，却没有显示疾病症状。

As is the case with all viruses, SARS-CoV-2, the causative agent of COVID, gains entry to cells by latching onto particular molecules, usually proteins, sitting in their surface membranes.

和所有病毒样，导致COVID的SARS-CoV-2通过附着在细胞表面膜上的特定分子，通常是蛋白质，来进入细胞。