While professional football and the degenerative brain disease known as CTE have long been linked, true prevalence has remained an open question. A new study finds that, among former NFL players who died between 2016 and 2021, at least a quarter had CTE.

Playing football has long been linked to the brain disease known as CTE, but how prevalent it is is still unknown. A new study of former NFL players who died recently found that at least 25% had CTE.

(Image credit: Patrick Smith)

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