The U.S. National Institutes of Health said on Wednesday it had begun a mid-stage study to determine the risk of allergic reactions to COVID-19 vaccines made by Moderna Inc (MRNA.O) and Pfizer Inc (PFE.N).
In January, the U.S. Centers for Disease Control and Prevention said allergic reactions are occurring at a rate of 11.1 per 1 million vaccinations.
The study, funded by the National Institute of Allergy and Infectious Diseases, will enroll 3,400 adults between the ages of 18 to 69, with about 60% participants having a history of severe allergic reactions to food, insect stings or immunotherapy.
The goal of the trial is to access the proportion of participants who have a systemic allergic reaction within 90 minutes after injection.
The agency expects to report data later this summer.
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