Overall, a decreasing trend was observed, particularly after the initial period from December 2020 to April 2021.
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Adverse Events of COVID-19 Vaccines in the United States: Temporal and Spatial Analysis.
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The method accounted for underreporting and zero inflation in passive surveillance systems and identified 14 AEFIs with significantly heterogeneous reporting rates over the years, including 2 events showing an increasing trend [ 43 ].