Comparison of Transient and Persistent Adverse Events After COVID-19 Vaccination: A Retrospective Analysis.

In the present study, the transient group had a higher incidence of adverse events after the first vaccination, whereas the persistent group showed a trend toward a higher incidence of adverse events after the second or third vaccination.

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Symptom onset in the persistent group occurred immediately after vaccination in 12%, on the day of vaccination in 20%, after one day in 32%, and after ≥ two days (maximum, one month) in 36%, with an increasing trend over time (Figure 4 ).

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