Respiratory viruses affect us throughout our lives, from infancy to old age, causing illnesses ranging from a common cold to severe pneumonia. They belong to several virus families, and although many features of infection with these diverse viruses are shared, some have unique characteristics. Here we explain what happens when we are infected by respiratory viruses, including SARS-CoV-2, which causes COVID-19.

中文翻译：

---

呼吸道病毒感染：了解 COVID-19。

呼吸道病毒影响我们的一生，从婴儿期到老年期，引起从普通感冒到严重肺炎的各种疾病。它们属于多个病毒家族，尽管这些不同病毒的感染有许多共同特征，但有些病毒具有独特的特征。在这里，我们解释了当我们感染呼吸道病毒（包括导致 COVID-19 的 SARS-CoV-2）时会发生什么。