Comparing the differences between COVID-19 vaccines – Mayo Clinic

Janssen/Johnson & Johnson - Side effects

Injection site pain, fatigue, headache, muscle pain, chills, fever and nausea

Note: If you received this vaccine within the last three weeks and are experiencing any unexplained new severe symptoms, seek emergency care.

Possible severe symptoms include shortness of breath, persistent stomach pain, severe or persistent headache, blurred vision, chest pain, leg swelling, easy bruising, and tiny red spots on the skin.

Rarely, some people may develop Guillain-Barre syndrome after getting the vaccine. Seek immediate medical care if you have weakness or tingling sensations, difficulty walking, difficulty with facial movements, double vision, and difficulty with bladder control.

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Comparing the differences between COVID-19 vaccines - Mayo Clinic