Viruses are tiny particles that can cause illness. There are hundreds of thousands of different viruses. If you’ve ever had a stuffy nose, you probably caught a virus that causes the common cold. More severe illnesses, like the flu, are also caused by viruses.
This new virus is a type of virus called a coronavirus. That’s because of the crown-like spikes on its surface. (Corona is another word for crown.) The virus causes an illness named COVID-19. Because the virus is so new, scientists have many questions about it. For instance, they are still learning how dangerous it is.