Coronavirus (COVID-19)

Causes

COVID-19 is the disease caused by a type of coronavirus, which is a family of viruses common in humans and many different animals. Viruses in this family can cause respiratory illnesses ranging from the common cold to more severe diseases. Cases of COVID-19, in particular, can be mild, but others can be more severe and occasionally deadly—especially for those living with other chronic health conditions.

You may have heard about variants of COVID-19 in the news, including the most recent one, the Delta variant. Variants are caused when the COVID-19 virus changes (known as mutation). Different variants may spread more easily, may cause more serious disease, and may not respond as well to treatment.

Therefore, it is important to continue to take steps to prevent the spread of COVID-19. So far, the COVID-19 vaccines protect against the known variants and vaccination is still the best protection available. However, no vaccine provides 100% protection against COVID-19 and its variants. Therefore, even people who are vaccinated should keep following recommended steps to protect themselves and others.

Last Updated August 2021