COVID-19 is an illness. It’s caused by a novel coronavirus. When a coronavirus is “novel,” that means it’s being seen in humans for the first time. That’s why people who study viruses are so concerned about COVID-19. Scientists are still learning about how it spreads and how it affects people.
Doctors say that most people who get the illness will get better. However, those over the age of 60 are at a higher risk for complications. So are people with chronic conditions like heart disease, lung disease, and diabetes. Those who have suppressed immune systems are also more likely to have problems.
Many people who have COVID-19 might not show symptoms at all. That’s one reason the illness has spread so quickly. People who don’t feel sick might not know they’re carrying the novel coronavirus. If they continue to come into contact with others, they risk spreading the illness. That’s why so many schools and workplaces have closed.
In the past, other coronaviruses have caused many illnesses. Some of these are fairly mild, like the common cold. Others are more severe. One example was the coronavirus that caused a Severe Acute Respiratory Syndrome (SARS) outbreak between 2002 and 2004. But the one that causes COVID-19 is different from these. As of now, the total number of infections in the world were over 400,000, and deaths more than 18,000.

