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By Zachary Stieber
Pfizer’s COVID-19 vaccine has been linked to blood clotting in older individuals, according to the U.S. Food and Drug Administration (FDA).
FDA researchers, crunching data from a database of elderly persons in the United States, found that pulmonary embolism — blood clotting in the lungs — met the initial threshold for a statistical signal and continued meeting the criteria after a more in-depth evaluation.
Three other outcomes of interest — a lack of oxygen to the heart, a blood platelet disorder called immune thrombocytopenia and another type of clotting called intravascular coagulation — initially raised red flags, researchers said.
More in-depth evaluations, such as comparisons with populations who received influenza vaccines, showed those three as no longer meeting the statistical threshold for a signal.
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