(Overall, 16 participants reported some level of swelling in their lymph nodes.) Only one trial participant had an adverse event after the booster that was considered to be severe: They experienced lymphadenopathy, or swelling of the lymph nodes, two days after the shot. Here's how common each of these side effects was among the participants: The most frequent side effects were injection-site pain, fatigue, headache, muscle and joint pain, and chills. In its booster trial, participants saw 3.3 times higher antibody levels one month after the booster than one month after their second dose. The agency said others who might consider a booster include younger adults with underlying medical conditions or those at increased risk of COVID-19 exposure because of their job or living arrangement.ĭata from Pfizer shows that protection from its vaccine declines over time, and that a third dose is safe. On Thursday, the Centers for Disease Control and Prevention recommended a booster at least 6 months after the second dose for: People 65 years and older, nursing home residents, and people ages 50 to 64 with underlying medical conditions. That includes people who are more likely to get sick because of their health status, as well those who are at high risk of exposure due to where they live and work - such as healthcare workers, teachers and daycare staff, grocery store workers, and residents of homeless shelters or prisons. The FDA has authorized a third dose, or "booster," for people 65 years and older and others at high risk of severe COVID-19. ![]() See more stories on Insider's business page.Ī third dose of Pfizer's coronavirus vaccine yields mild to moderate side effects, much like the second shot, according to data released this month by the Food and Drug Administration. I njection-site pain is the most common, as well as headaches and fatigue. Pfizer's COVID-19 booster shot yields mild to moderate side effects, much like its second dose. A health worker administers the Pfizer vaccine in the Palestinian neighborhood of Beit Hanina, in the Israeli-annexed east Jerusalem, on August 29, 2021.
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