The year-long study, published in Nature Medicine, assessed brain health across 44 different disorders using medical records without patient identifiers from millions of U.S. veterans.
Brain and other neurological disorders occurred in 7% more of those who had been infected with COVID compared with a similar group of veterans who had never been infected.
That translates into roughly 6.6 million Americans who had brain impairments linked with their COVID infections, the team said.
Compared with the control groups, people infected with COVID had a 77% higher risk of developing memory problems.
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