US investigates potential safety signal with Pfizer Covid boosters
The FDA and the CDC are investigating a “preliminary signal” of whether there might be an increased risk of stroke for people who got Pfizer and BioNTech’s updated Covid-19 vaccine booster.
In a statement posted on the CDC’s website, the agency said its monitoring system for vaccine side effects had been triggered to look for a potential issue with the shots in people ages 65 and older.
The CDC called the findings highly preliminary, and said that “no other safety systems have shown a similar signal and multiple subsequent analyses have not validated this signal.” That included analysis of other large vaccine datasets from Medicare, the United States Department of Veterans Affairs, the companies’ own monitoring programs and a vaccine side-effect reporting collection tool known as VAERS.
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