Aaron E. Carroll: Don’t worry too much about allergic reactions to vaccine

At this point, most of us have heard about allergic reactions to COVID-19 vaccines: the doctor in Boston who had to administer his EpiPen, the hospital worker in Alaska who had trouble breathing. But it’s not at all surprising that allergic reactions happen. What matters most is the severity and the rate at which they occur. And for the COVID vaccines, there’s no doubt that the value of vaccination outweighs the risk.The Centers for Disease Control and Prevention issued updated guida