And pneumonia, often triggered by bacterial or viral infections, attacks the alveoli themselves.

肺炎——常常由细菌或病毒感染引发——会攻击肺泡本身。

Broadly speaking, the genes less active in the lonely were those involved in staving off viral infections.

一般来说，孤独的人体内活力较低的基因是那些帮助人们避开病毒感染的基因。

Measles is a viral infection that is serious for small children but is easily preventable by a vaccine.

麻疹是一种病毒性传染病，这种传染病对幼儿来说很严重，但却很容易通过疫苗预防。

As such, it has worsened some viral infections, such as SARS and the flu.

因此，它加剧了一些病毒感染， 例如 SARS 和流感。

Because the flu is a viral infection, it cannot be treated with antibiotics.

因为流感是一种病毒感染，所以不能用抗生素治疗。

The most common cause of such a brain lesion is herpes simplex encephalitis, which is a viral infection that particularly affects the temporal lobes.

这种脑损伤最常见的原因是单纯疱疹病毒性脑炎，这是一种特异性影响颞叶的病毒感染。

Shivering is often caused by a cold environment, but it can also be a sign of a bacterial or viral infection.

发抖通常是由寒冷的环境引起的，但也可能是细菌或病毒感染的征兆。

" Innate immunity works at this level, by trying to reduce the viral infection and stop it from getting to the lungs, " he added.

" 先天免疫可以通过试图降低病毒感染并阻止其进入肺部来起作用的。"

There are a lot of variations of PCR, but let's discuss one that has been used recently for diagnosing a viral infection, specifically, what if you want to diagnose someone with COVID-19.

PCR有很多种，我们来主要讨论看看最近被用于诊断病毒感染的一种，具体而言，如果需要诊断某人是否感染了SARS-CoV-2病毒。