These typically start within the rst 1-2 days after the vaccine and only last a few days. Side e ects are more common after the second dose.

Pfizer-BioNtech

• Injection site reactions : 84%
  
• Flu like symptoms:
  
  • Fatigue - 63%
    
  • Headache - 55%
  • Muscle Pain - 38%
  • Joint Pain - 24%
  • Chills - 32%
  • Fever - 14%

Moderna

• Injection site reactions: 92%
• Flu like symptoms:
  • Fatigue - 69%
  • Headache - 63%
  • Muscle Pain - 60%
  • Joint Pain - 45%
  • Chills - 43%
  • Fever - 15%

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