How was the situation in the United States? From the Vaccine Adverse Event Reporting System co-managed by the Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration, we obtained the number of deaths within 7 days after COVID-19 vaccination in the United States from December 2020 to May 2021.4 The demographic structure of the United States was available from CDC Wonder online database,5 and the COVID-19 vaccine coverage rate from CDC Morbidity and Mortality Weekly Report.6 These data were used to calculate the proportion of deaths within 7 days after receiving COVID-19 vaccination per 100 1000 vaccinated persons, stratified by gender and age group. It was found that the mortality rate within 7 days after COVID-19 vaccination was higher for males than females and increased with age. But it was still much lower than the background mortality rate
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