Long Covid may lead to measurable cognitive decline, especially in the ability to remember, reason and plan, a large new study suggests. Cognitive testing of nearly 113,000 people in England found that those with persistent post-Covid symptoms scored the equivalent of 6 I.Q. But the experts said the findings are important because they provide numerical evidence for the brain fog, focus and memory problems that afflict many people with long Covid. “These emerging and coalescing findings are generally highlighting that yes, there is cognitive impairment in long Covid survivors — it’s a real phenomenon,” said James C. Jackson, a neuropsychologist at Vanderbilt Medical Center, who was not involved in the study. He and other experts noted that the results were consistent with smaller studies that have found signals of cognitive impairment.

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