As extra Americans proceed to get vaccinated towards COVID-19, U.S. officers proceed to observe for extreme allergic reactions and different adversarial occasions after getting the vaccine.

The Centers for Disease Control and Prevention mentioned early security monitoring has detected 21 circumstances of anaphylaxis, a extreme allergic response, after receiving the Pfizer-BioNTech COVID-19 vaccine.

The circumstances had been detected in a pool of 1,893,360 first doses administered from Dec. 14 to 23. This interprets to 11.1 circumstances of anaphylaxis per 1 million doses, mentioned Dr. Nancy Messonnier, director of the CDC’s National Center for Immunization and Respiratory Diseases, in a media briefing Wednesday.

This is greater than the flu vaccine, which has a mean end result charge of 1.3 circumstances per 1 million doses. However, Messonnier mentioned the speed of anaphylaxis within the COVID-19 vaccine remains to be thought-about a uncommon end result.

“We all would hope that any vaccine would have zero adverse events, but even at 11 cases per million doses administered – it’s a very safe vaccine,” she mentioned.

In 86% of the circumstances, signs started inside half-hour of vaccination, and 81% of them occurred in individuals with a historical past of allergy symptoms or allergic reactions, together with anaphylaxis occasions. Most of the sufferers who reported having this extreme allergic response – 90% – had been ladies.

Dr. Thomas Clark, an epidemiologist on the CDC, mentioned 19 sufferers used epinephrine, a drugs used to deal with extreme allergic reactions in an emergency state of affairs, and all the sufferers whose data was obtainable recovered.

A complete of 29 circumstances had been reported as of Wednesday and included some sufferers who obtained the Moderna vaccine, Clark mentioned. The company remains to be investigating these circumstances and plans to incorporate them in a future report.

According to the CDC, about 17 million doses of COVID-19 vaccine have already shipped all through the nation, shy of the 20 million federal officers promised to be distributed by the tip of 2020. As of Wednesday, 4.8 million individuals have already been vaccinated.

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Anaphylaxis is a critical, life-threatening allergic response and requires quick medical consideration, in response to the American Academy of Allergy Asthma & Immunology. Symptoms can embrace pores and skin rash, nausea, vomiting, issue respiration and shock. The most typical anaphylactic reactions are to meals, insect stings, medicine and latex.

The CDC mentioned it’ll proceed to observe for adversarial occasions, together with anaphylaxis, and can usually assess the advantages and dangers of vaccination. However, the COVID-19 vaccine continues to be “an important tool in efforts to control the pandemic.”

“We’re in the setting of 2,000 COVID deaths per day,” Messonnier mentioned. “It’s still a good value proposition to get someone vaccinated. Their risk from COVID and poor outcomes from COVID is still more than the risk of a severe outcome from the vaccine.”

Follow Adrianna Rodriguez on Twitter: @AdriannaUSAT.

Health and affected person security protection at USA TODAY is made attainable partially by a grant from the Masimo Foundation for Ethics, Innovation and Competition in Healthcare. The Masimo Foundation doesn’t present editorial enter.

This article initially appeared on USA TODAY: COVID vaccine: CDC stories extreme allergic reactions, anaphylaxis

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