Adverse Event Following Immunization (AEFI)

An Adverse Event Following Immunization (AEFI) is any undesirable health problem that happens after someone gets a vaccine. It doesn't necessarily mean the vaccine caused the issue, but the health problem occurred sometime after the shot. AEFI can range from mild reactions like soreness or fever to more serious issues, though serious side effects are rare. Monitoring AEFIs helps ensure vaccines are safe and effective, allowing health officials to identify, investigate, and respond to any potential risks, maintaining public trust in immunization programs.