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U.S. begins studying risk of allergic reactions to Moderna, Pfizer COVID-19 vaccines

April 7 (Reuters) - 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 and Pfizer Inc. (Reporting by Manas Mishra in Bengaluru; Editing by Shinjini Ganguli)

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