Could the COVID-19 vaccine cause a severe allergic reaction?

There is a small chance the COVID-19 vaccine could cause a severe allergic reaction. A severe allergic reaction usually occurs within a few minutes to one hour after getting a dose of the vaccine.

Signs of a severe allergic reaction include:

• Difficulty breathing
• Swelling of the of the face and throat
• A fast heartbeat
• A bad rash all over your body
• Dizziness and weakness

There may be other possible side effects of the vaccine. If you are experiencing unusual or worsening side effects, seek immediate medical care.