The purpose of this post-marketing study is to assess the safety of Comirnaty monovalentXBB.1.5. for booster vaccination children ages 6 months though 4 years under actual usemedical practice.
Not Provided
Biological: COMIRNATY intramuscular injection
Booster injection in the muscle, 1 dose
Inclusion Criteria:
  -  Children aged 6 months to 4 years at the time of the booster vaccination (4th dose)
     who (or whose representative) gave written consent to take part in the study.
Exclusion Criteria:
-There are no exclusion criteria for this study.
Pfizer Local Country
Tokyo	1850147, Japan
Pfizer CT.gov Call Center, Study Director
 Pfizer