Kawasaki disease following immunization reported to the Canadian Immunization Monitoring Program ACTive (IMPACT) from...

Area of Science:

• Pediatric Rheumatology
• Immunology
• Public Health

Background:

• Kawasaki disease (KD) is an acute systemic vasculitis affecting young children.
• KD has been reported as an adverse event following immunization (AEFI).
• Active surveillance is crucial for monitoring vaccine safety.

Purpose of the Study:

• To characterize KD cases following immunization in Canada.
• To assess potential safety signals of KD post-vaccination.
• To compare KD cases with non-cases regarding demographic and vaccination factors.

Main Methods:

• Utilized data from the Canadian Immunization Monitoring Program ACTive (IMPACT) from 2013-2018.
• Reviewed KD cases meeting Brighton Collaboration Case Definition (BCCD) levels.
• Compared demographic and vaccination characteristics between KD cases and non-cases.

Main Results:

• 58 out of 84 reviewed cases met BCCD criteria for KD.
• Most cases (81%) were classified as Complete KD (Level 1a).
• Commonly associated vaccines included diphtheria-tetanus acellular pertussis and pneumococcal conjugate vaccines.
• No significant differences in age, sex, symptom onset, or vaccines received were found between cases and non-cases.
• No safety signals were detected.

Conclusions:

• The study found no safety signals for Kawasaki disease following childhood immunizations.
• Vaccination remains a safe and critical public health intervention for children.
• Continued active surveillance is important for monitoring rare adverse events.