Booster shot side effects heart rate8/31/2023 ![]() ![]() "Potential risks of an mRNA COVID-19 booster dose include the rare risks of myocarditis and pericarditis, particularly in males aged <30 years, and the even rarer risk of anaphylaxis (the rate of anaphylaxis after a booster dose is not yet known)," the CDC said in new guidance published Monday about the booster shots. No cases of myocarditis were reported in Pfizer's clinical trial and only one case was so far reported in Israel after a booster shot, at the time the CDC's advisers were deliberating over booster shots last week. Some younger recipients - especially males under 30 years old - appear to be at higher risk of developing it after shots of the mRNA vaccines. The CDC's V-safe findings do not directly address cases of rare but more serious potential reactions from a booster shot like myocarditis, a type of heart inflammation that most patients recover from. ![]() The study's data only includes reports through September 19th, before Pfizer's booster shots were greenlit for a broader swath of Americans. ![]() "We will continue to evaluate data as it becomes available in real time and with urgency, and update our recommendations to make sure that all of those at risk have the protection they need," said Walensky.Īt least 3.4 million people in the U.S., according to the CDC, have so far "received an additional dose" of a COVID-19 vaccine since August 13th, when the third shots were first allowed for use in some immunocompromised people. The company's initial trials of the vaccine found some side effects were more common after the second dose compared to the first, like fever and redness around the injection site. Pfizer also reported similar results from its trials of a booster dose, saying reactions were "mostly mild to moderate and short-lived" in a submission to the Food and Drug Administration's vaccine advisers. The CDC's data echo similar findings by health authorities abroad in countries that have already rolled out booster shots of Pfizer's vaccine, like the United Kingdom and Israel. ![]()
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