![]() At its worst, the period beginning six to 12 hours after the shot is injected can feel like a bad flu and last about a day. 2 from Pfizer or Moderna, many people feel an all-over malaise, with chills, potential for fever, and body aches. Johnson & Johnson's vaccine, which is just one shot, tends to have milder side effects, with arm pain being the most common.Īfter shot No. Ian Haydonīy and large, the most debilitating reports of vaccine side effects come after the second dose of the two-dose shots. The side effects that night were "pretty miserable," he said. Haydon tested out a second vaccine dose that was more than double strength. ![]() The innate immune response is often why people get arm pain at the injection site. Second, there is an adaptive immune response, which can take a little longer to present. Professor Akiko Iwasaki, who studies viruses at Yale, says this process happens in two ways.įirst, there is the innate immune response, which happens almost immediately. After that, headaches, fatigue, and dizziness were the most common complaints.Īll this temporary pain is working toward one goal: getting your body ready to stand up to the coronavirus. No one in the US is required to report how they feel after a vaccination, but among nearly 7,000 volunteers who shared their side effects with the CDC that month, most noted some arm pain. ![]() Al Seib / Los Angeles Times via Getty Imagesĭuring the first month of COVID-19 vaccinations across the US, 13 million doses were given, according to the Centers for Disease Control and Prevention. On March 1, a woman receives a COVID-19 vaccine at a newly opened vaccination site in Los Angeles. ![]()
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