Disease or Condition of the Week

Learn key facts, prevention tips and take a quiz to test your knowledge about common and serious diseases and conditions for people of all ages.

Illustration of the ultrastructural morphology exhibited by coronaviruses

COVID-19 is a respiratory disease caused by SARS-CoV-2, a new coronavirus. It is thought to spread mainly from person to person. Symptoms can range from mild to severe, and certain groups of people are at higher risk for severe illness.

Page last reviewed: January 13, 2022