an infectious disease caused by a coronavirus (= a type of virus), that usually causes fever, tiredness, a cough, and changes to the senses of smell and taste, and can lead to breathing problem and severe illness in some people

You can reduce your chances of being infected with or spreading Covid-19 by wearing a face covering over your nose and mouth. 你可以通过佩戴覆盖口鼻的面罩来减少感染或传播2019冠状病毒病的几率。

How many people with COVID-19 are asymptomatic? 有多少患有2019冠状病毒病的人是无症状的？

The app shows the latest Covid rates in your region. 这个应用程序会显示你所在地区最新的2019冠状病毒病发病率。