“That’s actually the immune system working on the vaccine,” Schaffner said.Īs of Monday, Dec. They can make your arm sore, and cause fatigue, headache, or fever. It’s known that these shots can cause more local reactions similar to the flu shot, Schaffner said. No cases of anaphylaxis were recorded in the trials, but a small portion of trial participants experienced “hypersensitivity-related adverse events.” In clinical trials, Pfizer found that less than 1 percent of more than 22,000 people who received the vaccine experienced possible allergic reactions. “It’s still very early days, but we know it’s very unusual,” Schaffner said. The cases are under careful investigation to determine the nature of these problems, Schaffner noted. “Safety is being closely monitored as always with all vaccines, and especially now with the COVID-19 vaccines,” Bernstein told Healthline. ![]() Henry Bernstein, a pediatrician at Northwell Health’s Cohen Children’s Medical Center and a member of the CDC Advisory Committee on Immunization Practices (ACIP), said the CDC and the Food and Drug Administration (FDA) are closely monitoring reactions to the vaccine.
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