Coronavirus is a kind of virus that causes an infection in your nose, sinuses, or upper throat. Most coronaviruses are not dangerous. Some types of them are serious, though. Middle East respiratory syndrome (MERS) and Severe acute respiratory syndrome (SARS ) are important types of coronaviruses. In 2012, about 855 people in Saudi Arabia from MERS and 774 people died from SARS in 2003. Now in Jan 2020, WHO identified a new type in China and named it officially as COVID-19..
Creditable Source: WHO and CDC