The COVID-19 vaccines that are available [Johnson & Johnson, Comirnaty (Pfizer), and Moderna] do not include live COVID-19 virus. The Comirnaty (Pfizer) and Moderna vaccines have a very small piece of messenger RNA (mRNA), a type of material that our bodies already use to give the body instructions for making a protein from the COVID-19 virus. Once this protein is made, it tells the body to make antibodies to fight it. The Johnson & Johnson (Janssen) vaccine uses a small piece of DNA protected by a harmless adenovirus cell to deliver the instructions for making a protein from the COVID-19 virus.  If you are exposed to the virus that causes COVID-19, you will already have antibodies to fight the virus, and you will not get sick. Learn more at https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety.html.