An infectious disease caused by infection with the virus SARS-CoV-2.
COVID-19 primarily affects the respiratory system but can involve multiple organs and body systems. Symptoms range from none or mild illness to severe disease requiring hospitalization or intensive care.
SARS-CoV-2 spreads primarily through infectious respiratory particles. Vaccination, prior immunity, ventilation, and other measures can reduce the risk of severe disease and transmission, although protection varies over time and circumstances.
QUICK FACT
SARS-CoV-2 is the virus; COVID-19 is the disease it causes.
COMMONLY CONFUSED WITH
Influenza: both are contagious respiratory illnesses and can cause similar symptoms, but they are caused by different viruses.
SEE ALSO