As of Dec. 18, 3,150 people reported what the agency terms “Health Impact Events” after getting vaccinated....The CDC said that 272,001 doses of the vaccine were administered as of Dec. 19. That means most people who were vaccinated did not experience negative effects.

on Friday, the agency stressed that anyone who has ever had a severe allergic reaction to any ingredient in a COVID-19 vaccine should not get that vaccine. People with severe allergic reactions to other vaccines should consult their doctor about getting the new vaccine while those with a history of anaphylaxis not related to vaccines “may still get vaccinated.”