Twenty-nine people in the United States have developed anaphylaxis after being vaccinated against Covid-19 since the vaccine rollout began, health officials reported Wednesday, with cases occurring after vaccination using both the Pfizer-BioNTech and the Moderna vaccines.

The Centers for Disease Control and Prevention said at present it looks like anaphylaxis cases are occurring at a rate of about 5.5 per 1 million vaccine doses given, though the agency cautioned that figure may change as the vaccination effort continues.

The allergic reactions do not change CDC’s recommendations on who can be vaccinated against Covid-19, with senior officials stressing that the risk of severe illness and death from the disease still outweighs the risk of developing anaphylaxis after vaccination.

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