What is COVID-19?

COVID-19 is an infectious disease caused by the SARS-CoV-2 virus. Since it was first described in December 2019, the disease has spread globally. The SARS-CoV-2 virus is primarily spread through respiratory droplets and aerosols, so risk is highest when people spend extended periods in close proximity with someone who is infected. There are many symptoms that COVID-19 and the flu have in common, but certain symptoms, such as a loss of smell or taste, can be a distinguishing factor.