CTE found in nearly 90 percent of brains donated by football players

CHICAGO — Research on 202 former football players found evidence of a brain disease linked to repeated head blows in nearly all of them, from athletes in the National Football League, college and even high school.

It’s the largest update on chronic traumatic encephalopathy, or CTE, a debilitating brain disease that can cause a range of symptoms including memory loss.

The report doesn’t confirm that the condition is common in all football players; it reflects high occurrence in samples at a Boston brain bank that studies CTE. Many donors or their families contributed because of the players’ repeated concussions and troubling symptoms before they died.

“There are many questions that remain unanswered,” said lead author Dr. Ann McKee, a Boston University neuroscientist.

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