On February 19, 2021, the CDC published a report detailing the adverse side effects reported to the CDC’s phone-based Vaccine Adverse Event Reporting System (VAERS) between December 14, 2020 and January 13, 2021. The data reflects side effects reported for the two COVID-19 vaccines that have received Emergency Use Authorization for administration in the United States, the Pfizer-BioNTech COVID-19 vaccine and the Moderna COVID-19 vaccine.
During the first month of monitoring, 13,794,904 vaccine doses were administered. VAERS received 6,994 reports of adverse effects after vaccination. 90.8% were classified as nonserious and 9.2% were classified as serious. The report notes that while rare cases of anaphylaxis have been observed after receipt of both authorized vaccines, rates are comparable with those reported after receipt of other vaccines. A CDC analysis of the data concluded that these initial findings should provide reassurance to health care providers and vaccine recipients.
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