Over 1,200 adverse events were reported after receipt of Moderna Covid-19 vaccine as of January 10, with 10 cases determined to be anaphylaxis, according to a report released by the US Centers for Disease Control and Prevention (CDC) on Friday.
The US Food and Drug Administration issued an Emergency Use Authorization for Moderna Covid-19 vaccine on December 18, 2020, administered as 2 doses, 1 month apart to prevent Covid-19, the Xinhua news agency reported.
As of January 10, a reported 40,41,396 first doses of Moderna Covid-19 vaccine had been administered in the US, and reports of 1,266 adverse events after receipt of Moderna Covid-19 vaccine were submitted to the Vaccine Adverse Event Reporting System, according to the CDC.
Among these, 108 case reports were identified for further review as possible cases of a severe allergic reaction, including anaphylaxis.
Anaphylaxis is a life-threatening allergic reaction that occurs rarely after vaccination, with onset typically within minutes to hours.
Among these case reports, 10 cases were determined to be anaphylaxis, a rate of 2.5 anaphylaxis cases per million Moderna Covid-19 vaccine doses administered, said the CDC.
The median interval from vaccine receipt to symptom onset was 7.5 minutes.
The CDC urged locations administering Covid-19 vaccines to adhere to CDC guidance, including screening recipients for contraindications and precautions, having necessary supplies and staff members available to manage anaphylaxis, implementing recommended post-vaccination observation periods, and immediately treating suspected anaphylaxis with intramuscular epinephrine injection.
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