The coronavirus started in China in December 2019. In the city of Wuhan, patients began to arrive at hospitals with high fevers. They struggled to breathe. Some people did not get better, even under the care of doctors.
Little by little, the virus spread around the world. By the end of March, nearly one million people had gotten sick. More than 40,000 people had died.
The coronavirus causes an illness called COVID-19. It usually starts with a fever and a cough. Most people recover quickly. But in some cases, the virus causes serious lung disease. It’s especially dangerous for older people.
COVID-19 spreads easily from person to person. It spreads through handshakes and hugs. When a person who is infected with the virus coughs, the virus can hang in the air for a short time. Mostly, it settles on surfaces—doorknobs or counters or shelves. Healthy people can get the virus by touching those surfaces and then touching their eyes, nose, or mouth.