How much do you know about the novel coronavirus (新型冠状病毒)? It is this virus that causes COVID-19, an acute respiratory infectious disease (急性呼吸道传染病). Coronaviruses are a large family of viruses. The word “corona” comes from Latin (拉丁文) and refers to crowns (王冠). When people first saw a coronavirus under a microscope (显微镜), they found that its spikes (刺突) looked like a crown. That’s how the viruses got their name. Some coronaviruses cause illness in humans; many others are found in animals, including camels, cats and bats.