Children identified as having potential AEFIs in this manner were classified as having presentations that were ‘probably related to immunisation’ (symptom onset within 48 hours of immunisation, no alternative focus found), ‘possibly related to immunisation’ (symptom onset was within 48 hours of immunisation, possible alternative focus found) or ‘not related to immunisation’ (symptoms were not within 48 hours of immunisation or a definite alternative focus was found).
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