Any of a group of RNA viruses that cause a variety of diseases in humans and other animals.
Coronavirus disease 2019 (COVID-19) is an infectious disease caused by SARS-CoV-2, a virus closely related to the SARS virus. The disease is the cause of the 2019–20 coronavirus outbreak. It is primarily spread between people by small droplets from infected individuals when they breathe or cough. Time from exposure to onset of symptoms is generally between 2 and 14 days.