Adverse Event Following Immunization

**Semantic type:** Finding

**Definition:** Any unfavorable or unintended symptom, sign, or disease including an abnormal laboratory finding) temporally associated with the previous administration of vaccine(s) that may or may not be considered related to the vaccine administration. Such events can be intervention related, dose related, route related, patient related, or caused by an interaction with other product(s) or procedure(s).

**Synonyms:** - AEFI - Adverse event following prior vaccination