The vaccines carry some known side effects for the general public, including a fever, fatigue, headaches, and swelling at the injection site — similar to the effects of the flu vaccine. This week, the CDC released an analysis of nearly 2 million doses that showed just how uncommon more severe allergic reactions to the vaccine are: There were just 11.1 cases per a million administered doses. “At this point, we’ve had tens, if not hundreds of thousands, of people worldwide who have received the vaccines that are currently begin administered in the U.S,” Dr. Gonsenhauser says. “They’ve been shown again and again to be safe and effective.”
