Coronavirus vaccines are designed to teach our immune systems to recognize and fight the virus that causes COVID-19. This process can cause symptoms, such as fever, in some individuals. This is common and a sign that the body is building immunity. Learn about how COVID-19 vaccines work.
No serious side effects requiring hospitalization have been reported in clinical trials. In addition to fever, some trial participants reported fatigue, headaches, muscle and joint pain, and chills, all lasting about 12 to 24 hours.
As with any vaccine, an allergic reaction is possible but rare. If you know you have severe allergic reactions, you should make sure you receive the coronavirus vaccine in a medical setting where these rare reactions can be effectively treated.