![]() The signs are trouble breathing, swelling of the face and throat, rash, and low blood pressure. CDC estimates suggest anaphylaxis occurs in 11 cases per million doses among people receiving the Pfizer/BioNTech vaccine. Severe allergic reactions. Rarely, a potentially life-threatening reaction called anaphylaxis may occur, most often in people known to have had severe vaccine reactions in the past.What else should I know about possible side effects? painful, swollen lymph nodes in the arm where the vaccine was injected.A side effect or reaction isn't necessarily all bad, by the way it may indicate that the body is building protection against the virus.įor the four vaccines listed above, common side effects include When side effects occur, they typically last just a few days. In large clinical trials, most side effects have been minor. (Click here for additional information on available vaccines.) What are the most common COVID vaccine side effects? Not only do these vaccines appear to lessen risk of developing COVID-19, but they also appear to lessen the risk of severe disease. ![]() This vaccine is authorized for use in the US.
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