About COVID-19

COVID-19 is a respiratory illness caused by the SARS-CoV-2 virus. It circulates year-round, with increases in the fall and winter. Illness ranges from mild to severe, and some people develop longer-lasting symptoms.

Symptoms can include fever or chills, cough, sore throat, congestion, fatigue, muscle aches, headache, and sometimes a change in taste or smell. Symptoms usually appear two to five days after exposure but can take longer.

Who is at higher risk

Some people are more likely to have serious complications and should take extra care:

Prevention & vaccines

Stay up to date with the recommended COVID-19 vaccine. Good ventilation, testing when you have symptoms, and staying home when sick all help reduce spread.

See full details, including where to get vaccinated, on the Prevention & Vaccines page.

Treatment & when to seek care

Many people recover at home with rest and fluids. Antiviral treatment (such as nirmatrelvir-ritonavir) can lower the risk of severe illness for higher-risk people and works best when started within about five days of symptoms — contact your provider promptly. Home tests can confirm infection.