The Covid vaccines made by Pfizer-BioNTech and Moderna may be linked to a slight increase in the risk of stroke when administered along with a high-dose flu vaccine, according to a new analysis by the Food and Drug Administration.
The high-dose flu vaccine is usually given to older people, and the risk association is clearest in adults aged 85 and older. But that increase, if real, seems very small, and it is possible that the risk may stem from the flu vaccine alone.
A separate analysis by the agency points to a small increase in the incidence of seizures after Covid vaccinations in children ages 2 to 5. The papers were posted online last week, and have not yet been vetted for publication in a scientific journal. Experts in vaccine safety said the studies were well done.
Neither study is definitive, and even if these links were confirmed, the increases are so slight that the benefits of vaccination still far outweigh the risks, especially in older adults, experts said. Flu and Covid themselves both raise the risk of stroke.
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