Air travel makes it possible to spread infectious agents across the planet with amazing ease.

空中旅行使传染病病原体轻而易举地在全球传播成为可能。

Only later in the pandemic did the pathogen diversify, creating local reservoirs of infectious agents across Europe.

在这场疫情后期，病原体才开始多样化，导致欧洲各地形成传染源的局部储存宿主。

Other factors include climate change or the expanded habitat of an infectious agent.

其他因素包括气候变化或传染原的栖息地扩大。

To clarify these points: Pathogenicity is defined as the ability of an infectious agent to cause disease or damage in a host.

致病性的定义是一种传染性病原体在宿主体内引起疾病或损害的能力。

That increases your overall temperature, a protective mechanism that makes your body less habitable for infectious agents.

这会增加您的整体温度，这是一种保护机制， 可使您的身体更不适合传染性病原体。

In each case, the immune system gets its wires crossed and turns on healthy tissue instead of infectious agents.

上述每种疾病都会使免疫系统出现错乱，攻击自身健康组织而非病原体。

Alright, as a quick recap, viruses are a unique group of infectious agents with the simple, acellular organization and a distinct pattern of replication.

得！快速回顾一下：病毒是一种独一无二的传染因子；这类非细胞生物结构简单、复制模式独特。

Now, scientists at Harvard's Wyss Institute of Biologically Inspired Engineering have come up with a device that cleans blood without a need to diagnose the infectious agent.

而现在哈佛大学卫斯生物研究机构的科学家们已经设计出一种并不需要提前诊断感染原就能够净化血液的装置。

The problem is that the molecules antibodies recognise and react to are the big ones, such as proteins, that are characteristic of bacteria, viruses and other infectious agents.

问题是抗体能识别和做出反应的分子是大分子，比如蛋白质，这是细菌，病毒和其他致病原的特征。

Now most hospitals in the US and many other countries are already operating close to the capacity line, so when a pandemic occurs, the infectious agent spreads very rapidly and the curve can rise and cross the line.

目前，美国及许多其他国家的医院的工作量都已接近其最大负荷量，所以当大流行爆发时，病原体会迅速传播，而感染者数目也会很快超过医疗系统的最高负荷。